Poseidon can be repaired only in the level 7 Wharf. You can get the items for its construction from voyages using Poseidon itself. First of the voyages of this group, the one to Seattle, doesn't cause your yachts to break, if the level 7 Wharf hasn't been built yet. You can freely sail to Seattle and collect all the necessary items for the Wharf, complete it, and only after that go to other voyages of the Poseidon group.
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