Stingray (1964)

S1E33 Sea of Oil

While investigating the collapse of an oil drilling rig, Atlanta finds herself taken captive by an underwater civilization. She learns that the creatures attacked the rig out of fear, believing their territory was under siege. Meanwhile, a bomb has been secretly placed on Stingray, set to detonate as the ship dives. In a race against time, Atlanta desperately tries to warn Stingray. Luckily, Marina’s pet seal, Oink, uncovers the bomb and manages to push it off the ship just in time, averting disaster.