- The professor's data indicates that the island is sinking, but the men don't want to break the news to the women, who have the men in the middle of a landscaping project. The Professor ends up hurting his back, helping with a rock garden.
- As Gilligan (Bob Denver) collects the lobster traps from the Lagoon, the Professor (Russell Johnson) appears at the water's edge and points out a measuring stick to the Skipper (Alan Hale Jr) he has been using to mark the tide. Seeing as it is almost entirely under water, he concludes the Island may be sinking into the ocean. They choose not to worry the women with the news, but when Gilligan thinks wearing stilts is the answer, the Professor believes building new huts on higher ground may be the answer. However, building them in secret at night proves to be a challenge as Mrs. Howell (Natalie Schafer) and the girls want to landscape the hut area. Ginger watches as The Professor makes her a rock garden, though his back is sore, Ginger is happy and kisses his nose. At night, the men are trying to build a new hut, stumbling back to camp exhausted at dawn only for Mary Ann (Dawn Wells) to "wake" them to start working again. Meanwhile, the Professor checks his measuring stick in the Lagoon and discovers it's now completely submerged. He reveals the island may be sinking faster than he believed. They now realize they have but no choice to tell the women the truth, and Gilligan is forcibly drafted to tell them. However, Ginger (Tina Louise) misunderstands his awkward confession and thinks they're being rescued. The Skipper and Professor are astounded as to how Gilligan screwed up telling her, but Gilligan joyfully watches from afar as Ginger rushes up to them and has them confirm the news without telling the truth. The Professor fakes a transmitter with Gilligan disguising his voice as their contact, but after Ginger steps on Gilligan's foot, the deception is exposed. Hearing the truth, Ginger thinks they should build a large ark for them ride out the rising water. Mary Ann suggests building a hut on a previously made raft. The Professor also goes on to build a huge rope and pulley assembly to test the rocking of the craft on the ocean. On board, Gilligan and the Skipper live through the turmoil and disaster of extremely high tides rocking them back and forth and sliding the furniture around before finally collapsing on top of them. As the Skipper and Professor are trying to decide what to do next, Gilligan checks the lobster traps and comes back carrying the Professor's measuring stick. It turns out he's been moving the stick into deeper water to catch bigger lobsters, rendering all their hard work a waste of time. Since the island isn't really sinking, Gilligan gets stuck cleaning the mess by himself as punishment for starting the panic.
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