While exploring the River, Hammy and Martha find a sunken boat. Hammy is very excited and runs to get his diving bell to inspect the wreck. It's a lovely old tugboat, and he gets GP to build a raft with a hole in the middle so they can raise it. Using the Winchamabob they bring it to the surface.
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Ready to Watch Once Upon A Hamster, Season 4, Episode 17?