Also, it never occurred to me that anyone would see the entire front half of the Death Star sunk into an ocean and think the tides would somehow be MOVING it. It’s not floating ON the water, and I can’t imagine the tides are so strong that it’s being pushed across the bottom of the sea floor, either.
The dagger is goofy and dumb, but to suggest it’s goofy and dumb because the Death Star would have moved in the meantime doesn’t really make any sense. It’s not like a lightweight piece of detritus. It’s the entire front half of a moon-sized battlestation. It’s not going anywhere because the tides are a little choppy.