Ruiz himself called the Coast Guard and the FBI agents in charge of the smuggling case, so either there's a mole in the Coast Guard, or there's an issue with the FBI agents handling the case; someone definitely tipped them off.
Of course, there's another possibility. They might have realized the delivery men didn't return and didn't send a message, thinking they've been caught, so they need to escape quickly... But this possibility is very low, because if they were to flee, they'd just sail away from their current location. In this dark environment, it's hard to pinpoint the location of a boat on the sea, except if there's a radar.
Jimmy sighed, turned to look at the two people in the ambulance. If only everyone could be as sensible as they are, how much trouble would be saved for him.
Jimmy: "Ruiz, can you notify the police to search the shore? They must have escaped from the ship on a small boat, there might be something to gain along the shore."
