Plot hole: The hero had to dive to get in to the cave where the wrecks are but the baddies can just drive in with their boats.
Suggested correction: You hear explosions prior to Nate and Sully looking out to see their boats; they've blasted their way in.
Factual error: When they were in the underground chamber and it was filling up with water. Nate is still talking to Sully through his phone app, despite his phone being in his pocket which would make the call so muffled as to be inaudible.
Suggested correction: Nate was talking through the device in his ear, the issue with the phone is it breaking since it was submerged in water. The Bluetooth piece in Nate's ear is how he was communicating, not the Phone GPS App.