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A drowned caldera 25 kilometres wide, five tiers of depth, and leviathans that notice you before you notice them. Everything a captain needs to know is here.

- 17
- biomes
- 3
- leviathans
- 5
- ports
- 79
- map markers
The descent
From the reef to the Void
Scroll down to dive through the tiers of the caldera. The depth gauge follows you all the way.
The Rim
floor at 45–70 mThe reef crest around the whole caldera. Bright and shallow.
Sunlit Shelf
floor at 185–240 mSunlight still reaches down here. The best place to find your feet.
55–185 mCoral platforms, atolls with quiet lagoons, and grottoes. The brightest, calmest water in the caldera.
110–295 mA forest of basalt pinnacles up to 340 studs tall, joined by huge stone arches.
100–235 mA jade plateau cut into a maze of canyons, with hanging gardens and natural bridges.
70–235 mSand dunes, flat-topped guyots and blue holes.
115–180 mAn underwater forest: giant kelp that reaches almost to the surface.

You are not alone in open water
Thresher
An armoured sea serpent. It rams at full charge.
- Bite
- 280 hull
- Charge
- 180 studs/s
- Length
- 43× your Otter
OTTER CRUSH DEPTH · 450 m
The hull your Otter comes with gives up around here. Upgrades take it to 750 m. Upgrades
Twilight Shelf
floor at 500–560 mThe light is going. From here on you need your lamps.
350–560 mMk II hullStacked plateaus and mushroom-shaped table rocks.
350–560 mMk II hullLimestone hummocks, sugarloaf domes and pink feather trees.
430–580 mMk II hullTerraced craters packed with honeycomb towers.
410–565 mMk II hullConcentric hogback ridges and groves of sponges.
Midnight Slope
floor at 860–920 mFull dark. The only light comes from crystals and glowing weed.
540–1,155 mTwelve black terraces that step down from the Twilight Shelf to the very bottom.
765–1,035 mbeyond every hullDeep cracks lined with silver crystals, and geodes in the walls.
780–930 mbeyond every hullGlowing meadows of ghost weed, standing stones and ancient ruins.

The deep water belongs to it
Kraken
It grabs your sub and crushes the hull.
- Grab
- 280 hull
- Lunge
- 150 studs/s
- Length
- 40× your Otter
Abyssal Basin
floor at 1,240–1,300 mThe floor of the caldera: lava, sulfur and bones. Deeper than any hull can take.
1,085–1,320 mbeyond every hullVent towers, lava fissures and the skeletons of leviathans.
1,195–1,305 mbeyond every hullA cracked plain dotted with smoking mounds.
765–1,305 mbeyond every hullThe volcano at the very centre of the caldera, with lava running down its sides.
The Void
floor at 1,600–2,820 mPast the reef there is no floor. The Void Leviathan hunts here.

It already knows you are here
Void Leviathan
The invulnerable master of the dark beyond the rim.
- Bite
- 340 hull
- Charge
- 260 studs/s
- Length
- 170× your Otter
Tools

