It's time to get back to the car questions. Do I need to fear an underwater attack?
Yes was the clear winner with 100% of the votes selected from the following:
The answer to this question is indeed yes. I need to have an anti submarine device fitted to the car. No, not depth charges, but something that stops you sliding under the lap belt if you use a harness. A full harness is either a 5 point or a 6 point, however you need seats that accommodate this. My seats will fit a 4 point harness as they have the holes at the top of the seat backs. The issue with a 4 point harness is that they stop your shoulders from coming forward in a crash and actually push you down under the lap belt so you go under the restraint (submarining). What a 5 or 6 point does is have 1 or 2 straps between your legs going through the seat to the floor. This enables your testicles to stop you from sliding down. Probably with a force of 10x your weight, so you will live, but might talk in a higher pitched voice. You can, however, get 4 point harnesses with anti submarine features. What happens with your regular 3 point seatbelts in a car is that you come forward and twist a little, preventing you from slipping down below the lap belt. The ASM harnesses have one of the straps with additional webbing that will give in an impact causing you to twist and not drop under.