If you open the PDA and then as soon as you close it, enter a seamoth/prawn suit then you can use the tool inside the vehicle. the only tools that work with this glitch are the laser cutter and repair tool
Using the repair tool you can take your seamoth/prawn suit down to deeper depths by using repair tool inside the vehicle
I used this to get into the lava zone with my seamoth but i couldn't find the thermal plant
Also, you can glitch through the first door of the primary containment facility by driving your seamoth through. this lets you swim inside the first room but you cant glitch into the aquarium with this