How does a scuba diver suit help protect them from the ocean?

Answer 1

Sea snakes are actually relatively rare creatures. Divers who dive in areas where sea snakes are known to exist (Western Pacific and Indian ocean) simply take care not to interfere with the animals (which are actually quite docile). Sea snake bites are rare in themselves, and usually happen to paddlers who step accidentally on the snake.

Answer 2

It keeps the body temperature close to normal, or attempts to do this. It also protects against coral abrasions and various other exposure to underwater animals or obstacles. Wetsuits are referred to as "exposure suits" in the diving industry.