There are two ways of handling pressure. One is illustrated by a bathysphere, the miniature submarine used to explore the ocean in places so deep that the water pressure would crush a conventional submarine like an aluminum can. Bathyspheres compensate with plate steel several inches thick, which keeps the water out but also makes them heavy and hard to maneuver. Inside they'…
ChristianGlobe Networks, Inc., Illustrations from ChristianGlobe, by Brett Blair