Voyage to the Bottom of the Sea (1964)

S3E22 No Escape from Death

Title: Trapped Beneath the Waves Plot: During an underwater mission to locate an enemy base, the Seaview is unexpectedly struck by a rival submarine. As time is of the essence, the crew scrambles to fix the damage before their air supply dwindles. Meanwhile, Captain Crane leads a team on a dive, unaware that a menacing creature is stalking them in the depths.