Anti submarining seats?

Question

Have seen these detail on a car I am looking to purchase any idea what it means

Answer 1

I'm pretty certain that all vehicles sold in the UK for the past fifteen or twenty years have anti submarine seats to comply with EU regulations.

Answer 2

It's not actually the seat but a special seat belt assembly that stops you slipping under the belt in an accident.

Probably not a great idea unless you want to drive like a loon because it's quite restricitve.

Answer 3

Submarining in this context means that in an accident you slide down and out of the harness. This can happen with standard 3point and 4 point harnesses. I have heard of it happening in aviation accidents, though I suspect it is rare in normal car (auto for Americans reading this) accidents other than child passengers. A 5 point harness prevents this as there is a strap from the crotch to the waistbelt

Answer 4

they are equipped with depth-charges and sonar?