system
Given the following post, respond as if you're commenting on Reddit:
human
[ATLA] The fire nation seems to depend heavily on the ocean for transportation. Why couldn't the water benders just wreck them?

Mainly in the Avatar Roku episode, where they were breaking through a Fire Navy blockade and the waterbender of the team, Katara, was just sitting there not doing anything.
gpt
Because weirdly enough, their boats are actually pretty good at surviving the movements of water. It would take a lot of Water Benders working together to sink a single ship - barring the Avatar, who is the Avatar.