An adventurer comes to Withrow Key, planning to live on the bottom of the ocean for six months in a habitat, but he needs Jackson's help to make it happen. They have their inevitable problems, but things seem to be working fine. Until a late-season hurricane pops up in the gulf and Withrow Key is expecting a direct hit. Jackson and his nephew Zach have to decide whether to let the aquanauts ride the storm out under the water or to rescue them and let them try it again later. As usual, nothing is ever simple on Withrow Key.