Deep Sea Diving Mod 1.7.10, 1.7.2 adds:

• Scuba Mask (When equipped, you will receive water breathing and night vision upon entering the water)
• Air Canister (used in the crafting recipe for the scuba mask. Is not consumed upon crafting)
• Flippers (When equipped, you will receive speed upon entering the water)
• Harpoon Gun (can be combined with a harpoon in a crafting table to create a loaded harpoon gun)
• Harpoon Gun (Loaded) (single shot projectile weapon)
• Harpoon (combined with the harpoon gun to create a loaded harpoon gun)

Download Deep Sea Diving Mod 1.7.10, 1.7.2