Puncture leaks in the lower tubes, or bottom of an inflatable life raft should first be stopped by using __________.

Correct Answer: Option C — sealing clamps

Sealing clamps are the primary emergency tool for stopping significant punctures in inflatable tubes. They provide an immediate, mechanical seal that prevents rapid air loss before more permanent repairs, such as vulcanizing patches or adhesive-backed tape, can be applied in a controlled manner by the survivors.