Fathometer failure turns deep water into a navigation risk

The fathometer and precision depth recorder had been building a continuous bottom profile, with the recorder taking about thirty soundings each minute. That work had already identified previously uncharted seamounts. Their failure became urgent as Triton approached shallower water and Cape Horn, because a deep-diving submarine needs much greater clearance than a surface ship. The crew used active sonar to investigate possible hazards while technicians traced the fault to cooling-related component failures and restored both systems. Beach then imposed stricter monitoring, turning the repair into an operational-readiness lesson.