A submarine called the Deep View 66 is being developed to take 66 tourists at a time on sightseeing trips to tropical coral reefs. According to guidelines of the American Society of Mechanical Engineers (ASME), to be safe for human occupancy the Deep View 66 must be able to withstand a pressure of 10.0 N per square millimeter.

(a) To what depth can the Deep View 66 safely descend in seawater?

(b) If the submarine is used in freshwater instead, is its maximum safe depth greater than, less than, or the same as in seawater? Explain.