At the depth you were at and for the amount of time, if that is a Renix jeep, you most likely got water in the computer. Do not turn on the key until you pull the computer, take the case off, and wash the computer board under clean running water. Then let it get good and dry. Placing it on the rack in your oven and putting the temp to the lowest setting for a couple of hours should suffice. I'm and electrical engineer, so don't think I am a crack pot about this.