Nope! :^) In the boat question, when the bolts are in the boat they are displacing water equal to their weight. After they drop to the bottom, they are displ

Nope! :^) In the boat question, when the bolts are in the boat they are displacing water equal to their weight. After they drop to the bottom, they are displacing water less than their weight. So less water is displaced, i.e. total water level drops.