New Items -
Oxygen Tank
Swim Goggles
Flippers
Torpedo
The Fanny Pack
New Monster -
Coral Mimic
Sea Snake
The Spine
The Evolved Angler
Location -
Lake
How To Enter:
By jumping into the lake, you enter the diving update, a deep expansive area of water you can swim around in, open treasure chests, mine items, etc.
Oxygen Tanks let you breathe in there but at the cost of not being able to put a backpack on.
Torpedos let you move quicker.
Swim Goggles let you see better underwater.
Flippers allow you to swim faster and easier.
Fanny Pack can be put in one of your holsters, and works as a backpack.
Coral Mimic works like a normal mimic except for the coral found in the water, a way to tell normal coral away from mimic coral is if it is shaking.
The Sea Snake: A large snake like creature swimming around the shallow section of the lake, and can be easily outrun, you can anger it by being too close.
The Spine:
Found in the medium depths of the lake, it is a large skeletal structure of a fish of some sorts, that moves quickly but when attacking only moving in a straight line, you can anger it by looking at it for extended periods of time.
The Evolved Angler:
Found in the deepest parts of the lake, the evolved angler is a huge variant of the normal angler covered in more teeth, and with deep red eyes.
How to get loot:
Loot found in the lake is better the deeper you go, with many chests, new ores, etc.