Lobster pot
A baited trap on the seafloor — an entry that is easy to make and harder to undo.
A lobster pot in a dream is the dream's image of an entry that is easy to make and very difficult to undo. The lobster walks in for the bait; the design of the door does not permit reverse passage. The dream brings the pot when something in your life — an agreement, a debt, a commitment — was entered for a clear good reason and is now being discovered to be very hard to come out of. A pot pulled up by the boat is the dream affirming that the trap is ending as the bait was meant to. A pot lost on the seafloor with the creature inside it, the line broken, is the dream noting that the entry was made and no one is now coming to lift the pot, and the trapping has become its own forgotten ending.