Jarrod A. Freeman's Submarine Dwellers

Years ago one of the World's first submarines was sent on an expedition to the bottom of the ocean. this year 2023. Scientists have engineered a submarine which can handle the task. however only can be powered by two people so the scientists used the married couple who have years of expertise in the field of submarine driving. but however they need to find and locate the submarine and bring it back. however they need to figure out what took the submarine down.