there are 2 keys that i am aware of one under the crab then the other is in captain ziggs secret passage
how to do the bridge terminal on poptropica's steamworks island
steamworks island
It's Steamworks Island #14th Island
the crab on steamworks island is next to the living quarters
Steamworks island
Beat the island.
you go in it
Steamworks Island.
Jump on it.
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on the trash can
you do nothing