We have been sending Styrofoam cups down with the box corer and rosettes in a mesh bag. The high pressure (about 320 atmospheres or 4700 psi where we sampled from) near the ocean floor pushes all of the air out of the Styrofoam and shrinks the cup; so the cup on the left was the size of the cup on the right when we started! We write and decorate the cups before they go down. This one is for you Bowman family, it went down 3176 meters :)