Objective 1: Find the Submarine BayFind the secret passage the leads to the hidden submarine bay, and then locate the submarine that holds Atlas’s family. Access to the submarine bay is hidden within Fontaine Fisheries. 
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Follow the narrow passage away from Fontaine Fisheries into the Flooded Cave. Search the numerous crates scattered throughout the area to see what kind of tasty vittles and spirits might be contained within and continue on past the Gene Bank.
Climb the rocky path to the Storage Cave with Electro Bolt on the ready—there’s a Turret behind the crates that will begin firing before you can see it. Collect the items in the far corner near the Audio Diary and continue onward to the Control Room.