In order to access underwater zones, the player must equip a source of air such as old SCUBA tank or have an air-supplying effect.
Trying to adventure underwater without an air supply yields the message:
- You can't adventure there without some way of breathing underwater...
Trying to adventure underwater with insufficient adventures remaining yields the message:
- You don't have enough time to adventure there...
Trying to access The Sea Monkees' Castle without an air supply yields the message:
- You can't visit the Sea Monkees without some way of breathing underwater.
Trying to access the Mer-kin Temple without an air supply yields the message:
- You can't go in there without being able to breathe water.
- You need some way of breathing underwater to mine there. Maybe something in your inventory can help?
The following is a list of all sources of air:
|aerated diving helmet||Hat (requires quest)||Always||
|crappy Mer-kin mask||Hat (requires quest)||Always||
|Mer-kin gladiator mask||Hat (requires quest)||Always||
|Mer-kin scholar mask||Hat (requires quest)||Always||
|old SCUBA tank||Back||Always||
|oxygenated eggnog helmet||Hat||Always||
|The Crown of Ed the Undying||Hat||Always||
|Driving Waterproofly||Asdon Martin||30 Adventures||
|Mer-kinny Flavor||mer-kin paste||10 Adventures||
|Oxygenated Blood||ballast turtle||20 Adventures||Only Turtle Tamers can obtain this item||
|Pneumatic||pressurized potion of pneumaticity||20 Adventures||Only players with Deep Saucery can craft this item|
|Pumped Stomach||tempura air||20 Adventures||Only players with Tempuramancy can craft this item|
|Really Deep Breath||hyperinflated seal lung||20 Adventures||Only Seal Clubbers can obtain this item|
|fish juice box||30 Adventures||Item also gives 20 adventures of Fishy|
|Hyperoxygenated Blood||powdered oxygen||10 Adventures||
Adventuring in an underwater zone costs two (2) adventures unless you have the Fishy effect active. This applies to any underwater encounter, including special holiday monsters encountered while adventuring underwater. At the end of any combat which costs two adventures, the following message appears:
- "Being underwater makes it hard to move -- it's really slowing you down!"
This extra adventure cost is applied after the combat has been completely resolved. This means, amongst other things, that escaping from combat with items like tattered scraps of paper will still result in you losing one adventure, not 0 or 2, if you are not Fishy. Similarly, status effects gained at the end of combat, such as Beaten Up, will lose one more turn of duration than normal, if you are not Fishy.
These effects are demonstrated in-game by dolphins snagging not-quite-dropped items, and some of the Meat sinking beyond your grasp:
|Minor||The Briny Deeps||-25%|
|Moderate||The Brinier Deepers||-50%|
|The Sunken Party Yacht|
|High||The Briniest Deepests||-75%|
|The Sea Floor||An Octopus's Garden||-100%|
|The Wreck of the Edgar Fitzsimmons|
|The Mer-Kin Outpost|
|The Skate Park|
|The Coral Corral|
|Crushing||The Ice Hole|
|The Mer-Kin Deepcity||Mer-kin Colosseum||-150%|
|Mer-kin Elementary School|
|Intense||The Marinara Trench||-200%|
|The Dive Bar|
|The Caliginous Abyss|
Certain items and effects help to reduce these penalties. The reductions stack up to the penalty the zone imposes. For example, equipping a diving muff while having a Brined Liver in The Briny Deeps changes the pressure penalty of the zone to 0%; not a bonus of +5%. Penalty-reducing equipment and effects are labeled with the description "Makes you a better diver."
The following is a table of all known penalty-reducing effects.
|Goggles of Loathing||Hat||10%||150 mys||
|cozy scimitar||2-handed weapon||30%||85 mus|
|Staff of the Cozy Fish||2-handed weapon||30%||85 mys|
|cozy bazooka||2-handed weapon||30%||85 mox|
|over-the-shoulder Folder Holder||Accessory||10%||Seawolf folder||
|aquamariner's necklace||Accessory||10%||85 mys||
|aquamariner's ring||Accessory||10%||85 mys||
|diving muff||Accessory||10%||85 mys|
|hand-knitted diving booties||Accessory||?%||
|teflon swim fins||Accessory||10%||85 mus|
|gnomish swimmer's ears||Familiar Equipment||10%||
|Donho's Bubbly Ballad||Effect||20%||AT song slot|
|Hairless and Airless||Effect||20%||
|Swimming with Sharks||Effect||20%|
|Dreaming of a Wet Crimbo||Effect||?%|
Dolphins steal an item with a chance equal to the base chance of you getting the item, multiplied by the pressure penalty. So, if an item has a 30% drop rate, in a 50% pressure zone, dolphins will steal it 15% of the time post-combat. However, dolphins can only collect an item if you wouldn't have gotten it anyway (because of this, if you can cap an item to 100% drop rate, dolphins will never steal it). The steal rate does not change as your item increases: in the 15% example, if you have an adjusted 30% drop rate for the item, dolphins will steal it half as often as you get it, and if you had an 85% chance of getting it, dolphins will always steal it when you miss. It is important to note that despite the tie-in with the pressure, negating the pressure does not change the appearance rate of dolphins.
If multiple drops from a monster roll as being stolen by dolphins, then only one of those drops (at random) will actually be stolen, and the other will fail to drop entirely.
While wearing Dolph Bossin's Crimbo hat, dolphins sometimes will return the latest stolen item after every successful combat with the following message:
A dolphin swims up, nods to your hat, and bats an item toward you. You acquire... something.
All monsters encountered while underwater are immune to CLEESHing. This includes special holiday encounters such as the Feast of Boris monsters. Trying to cast CLEESH on any of the monsters gives the message:
- "You cast CLEESH at your opponent, but it apparently doesn't work on things that already live underwater."
Since all underwater item drops are conditional drops, any effects that disintegrate an underwater monster will not force its items to drop. The only exception to this is the pulled yellow taffy.
Stealing items with Using the Force does, however, work on most Sea items.
Feel Envy does not work underwater.
To adventure underwater, your familiar must be able to breathe underwater. Otherwise, this message appears:
- "You can't adventure there now -- <familiar name> wouldn't be able to breathe!"
Most familiars cannot breathe underwater without help in one of the following forms:
|das boot||Familiar equipment||-10 to Familiar Weight|
|Driving Waterproofly||Effect (Asdon Martin)||30 Adventures. Costs 37 fuel.|
|little bitty bathysphere||Familiar equipment||-20 to Familiar Weight|
|Wet Willied||Effect (willyweed)||30 Adventures. Sent by your pen pal.|
Water-breathing familiars are innately able to breathe underwater and don't need your help. The following are the only water-breathing familiars in the game:
|8||Barrrnacle||Delevels at the start of combat.|
|30||Emo Squid||Combines the properties of a Levitating Potato and a Barrrnacle.|
|100||Cuddlefish||75% Levitating Potato and 75% Ghuol Whelp on land.||100% Levitating Potato and 150% Ghuol Whelp underwater.|
|102||Imitation Crab||Attacks enemies 4 times per round. Caps at 10 damage per hit on land or 20 with imitation whetstone.||No damage cap underwater.|
|104||Magic Dragonfish||Boosts Spell Damage% equal to Weight x2. Damage bonus caps at 50 pounds (+100%) on land.||Spell damage bonus uncapped underwater.|
|106||Midget Clownfish||Sleaze alignment Star Starfish: 100% Star Starfish on land.||150% Star Starfish underwater.|
|114||Rock Lobster||Hot alignment Star Starfish: 100% Star Starfish on land; sometimes drops floaty sand at the end of combat.||150% Star Starfish underwater.|
|115||Urchin Urchin||Acts as a full Leprechaun on both land and sea.|
|116||Grouper Groupie||Acts as a full Baby Gravy Fairy on both land and sea.|
|117||Squamous Gibberer||Acts as a full Levitating Potato and Ghuol Whelp. Also grants bonus rollover adventures like the Wild Hare||Bonus rollover adventures counter is counted double while underwater.|
|119||Dancing Frog||Acts as a full Leprechaun/Baby Gravy Fairy.||Water-breathing with amphibious tophat equipped.|
|162||Reagnimated Gnome||Acts as a Baby Gravy Fairy.||Water-breathing with gnomish swimmer's ears equipped.|
|172||Adorable Space Buddy||Acts as a Spooky Lime/Ghuol Whelp with huge stat bonus every 300 combats.|
|209||Space Jellyfish||Drains your enemies and makes "delicious" jelly, delevels and grants the jump at start of combat.||100% Volleyball and 100% Baby Gravy Fairy underwater, plus some surprises.|
|211||Robortender||Acts as a Leprechaun, grants PvP fights, discovers new cocktail ingredients and more.||Water-breathing if fed either low tide martini or Bloody Nora.|
|266||God Lobster||Acts as a Volleyball or other basic familiars with familiar equipment. Gives 3 free fights per day that give familiar equipment, buffs, or experience.|
|275||Red-Nosed Snapper||Acts as a Baby Gravy Fairy. Allows you to track phylum-aligned monsters, and drops items based on the tracked monster type.||150% Baby Gravy Fairy underwater.|
Certain special pieces of familiar equipment have unique effects when adventuring underwater:
|fishy wand||Causes damage or produces meat sometimes|
|Li'l Businessman Kit||Produces a sand dollar sometimes|
|oversized fish scaler||Produces a dull fish scale sometimes|
Underwater-specific items and effects
Besides the pressure penalty mitigation effects and familiar equipment listed above, there are other items and effects which operate differently underwater.
|Busker Do||Effect||Acquire a sand dollar at the end of every underwater combat.||30 turns||None||Obtained from visiting The Bandshell 1/day|
|Colorfully Concealed||Item||Monsters will be less attracted to you. (Underwater only)||10 turns||Item loss||None||Obtained from Mer-kin hidepaint|
|Crocodile Tear||Item||Familiar weight +10 lbs (underwater only)||15 turns||Item loss||None||Obtained from temporary teardrop tattoo|
|eelskin shield||Off-Hand Item||Damages Attacking Opponent (Underwater Only)||Always||85 Musc||Maximum HP/MP +55|
|eelskin hat||Hat||Damages Attacking Opponent (Underwater Only)||Always||85 Myst||Spell Damage +15%|
|eelskin pants||Pants||Damages Attacking Opponent (Underwater Only)||Always||85 Mox||Mysticality +5%|
|Emotion Sickness||Item||Item drops: +X% Item drops from Monsters
Meat drops: +2X% Meat drops from Monsters
|Eyes of the Dragon||Effect||Item Drops: +100% Item Drops from Monsters (Underwater only)||20 turns||None||Obtained from Dragon the Line|
|Familial Ties||Effect||Familiar weight +10 lbs (underwater only)||30 turns||None||Obtained from visiting The Eclectic Eels 1/day|
|Fishbreath||Item||Monsters in The Briniest Deepests flip out, increasing their attack. Allows shark cartilage, eel battery and temporary teardrop tattoo to drop.||5 turns||Item loss||None|
|Fishy||Several (items + effect)||Underwater adventures take one turn instead of two||Varies||Varies||Varies|
|Glowing esca||Off-hand item||Item Drops: +20% from Monsters (Underwater only)||Always||85 Mys||Obtained from Fisherfish|
|Greased-Up Familiar||Item||Familiar weight +5 lbs (underwater only)||40 turns||Item loss||None||Obtained from sea grease|
|It's Electric!||Item||Damages Attacking Opponent (30-40 damage above water, 60-80 damage underwater)||15 turns||Item loss||None||Obtained from eel battery|
|Mer-kin begsign||Off-Hand Item||+40% Meat Drops from Monsters (Underwater only)||Always||85 Mys||Delevels opponent on attack|
|Mer-kin hookspear||Weapon (1H, melee)||Extracts 15-20% of the monster's base Meat drop on the first critical hit of the fight (25-35% Underwater)||Always||85 Mus|
|Mer-kin sneakmask||Hat||Monsters will be less attracted to you. (Underwater only)||Always||85 Mox||
|Mer-kin takebag||Off-Hand Item||Item Drops: +5% Item Drops From Monsters (+15% Underwater)||Always||85 Mys|
|octopus's spade||Weapon (1H, melee)||Enables the Sunken, Buried adventure in An Octopus's Garden||Always||85 Musc||
|pearl diver's necklace||Accessory||+30% Item Drops from Monsters (Underwater only)||Always||85 Mys||
|pearl diver's ring||Accessory||+20% Item Drops from Monsters (Underwater only)||Always||85 Mys||
|Peppermint harpoon gun||Weapon (2H, ranged)||Weapon Damage +100 (Underwater only)||Always||None||
|plush sea serpent||Accessory||-100 to Monster Level (Underwater only)||Always||None|
|straw hat||Hat||Enables the In the Shade adventure in An Octopus's Garden||Always||85 Mox||
|Swimming Head||Effect||Item Drops: +25% Item Drops from Monsters (Underwater only)||30 turns||None||Obtained from visiting A Merry-Go Round 1/day|
|Trusty seahorse||Special||Combat Initiative effectively increased by +100% (Underwater only)||Always||None||You must tame a wild seahorse by using 3 sea cowbells followed by a sea lasso while having 20 lasso skill.|
|Ze™ goggles||Hat||Item Drops: +25% from Monsters (Underwater only)||Always||None||Found while diving for treasure in an Olympic-Sized Swimming Pool|
Some combat items work differently or only when used underwater:
- Imitation crab meat
- Ink bladder
- intact anemone spike
- Live nautical mine
- Mer-kin killscroll, Mer-kin pinkslip and Mer-kin healscroll have special effects on mer-kin enemies.
- Pool torpedo
- various colours of pulled taffy
- S.A.V.E. flyer
- underwater slingshot
- Violet Fog flashbacks can happen even if you lack the ability to breathe underwater.
- An extremely helpful guide to Seaventuring was compiled by cannonfire40 and is available here.
- The May 22, 2013 trivial update rescinded the previously existing 10 turn refractory period between dolphin whistles. You can now obtain any item a dolphin steals, regardless of how often he appears.