[he's not even paying attention to his fishing pole anymore, but he's not getting bites anyway. alien fish just don't know good bait.]

A submarine - a ship that travels underwater. My Polar Tang is one, and while it does have a rounded keel, not square...I suppose it also has enough air inside to compensate.

The Null's metal was heavier, at least in later adaptations as they tried to keep themselves from getting sliced open. Unless it's possible to reforge it and hammer it out into thin sheets? [he seems to remember something about one of the elves having a forge]