Answer / Explanation:
Susan is worried because she knows that for every ten (10 meters) below sea level, the pressure increase for about one atmosphere. The pressure at 10 meters below sea level will therefore be about 2×105 Pas. At this point, the pressure at 10 meters below sea level is twice as high as the atmospherics pressure which is very dangerous to human health. At this depth, Tom will find it very difficult to breath with the lower pressure atmospheric air passing through the pipe when the higher pressure of the depth and the water are pressing against his chest. This might eventually cause his lungs to collapse.
