[LeifCarrotson]

Scents do not travel back up a drain pipe, and I doubt that sounds or other effects do, either.

And while a lost human might reason about following a river to civilization, I don't think there are similar drains in the ocean. If it made that connection, I am seriously impressed! While that's a well known tactic for explorers, many lost humans don't know it and don't figure it out!

My leading guess, though, is that he observed workers pouring other ocean things, probably including some tasty octopus food, down the drain.

[theandrewbailey]

> Scents do not travel back up a drain pipe, and I doubt that sounds or other effects do, either.

Properly engineered drains are, especially if they have traps. You must hang around different drains than I.