The Deep

The Deep, An ocean on the land.

The Caverns
The Deep's cavern's entrance is faced up, the structure looking kinda like a little spray of water, the caverns are made of Mysticstone, on the inside is a giant open area formed in a circle, you'll have to dig through the blocks in order to get to the Water Spores, if you break three of these Water Spores The Ink Lord will spawn.

Monsters
Giant Crab:

Damage: 25 / 50 (44)

Max Life: 70 / 140 (154)

Defence: 10

Flying Squid:

Damage: 22 / 44 (78)

Max Life: 40 / 80 (176)

Defence: 8 / 8 (16)

Octocrawler:

Damage: 30 / 60 (54)

Max Life: 60 / 120 (132)

Defence: 8

Other
In Deep Worlds will spawn Mystic Ice which can be turned into Mystic Ice Bars