system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: I understand land snakes but how do sea snakes manage to maneuver themselves through water, what are they pushing away from?
gpt
The water, same as everything else that swims.

Snakes are pretty well built for swimming. Their entire body is basically one big fin. Sea snakes especially are usually flatter than their land-dwelling cousins to maximize their swimming efficiency.