Gray Lady Down

Debut theatrical feature film of Christopher Reeve who portrayed Phillips.

The concept of using a shaped charge underwater is somewhat of a fallacy. In normal circumstances the nature of the surrounding air would allow for a great deal of compression which allows the charge to work. Even so, the explosion still has some degree of impact in all directions. Water, however, does not compress, which greatly reduces the directionality. The impact would still be enough to rupture the hull.

Edited from Ice Station Zebra (1968)