Place BLUFOR or OPFOR speed boat into the map as player as driver. Easiest place to test for example would be at the island Pythos.
Drive the boat at 1km/h (or even allow it to drift at 0km/h if you have the patience) into shallow water, shallow rocks, and land at varying angles.
Unless there are large waves, the boat often immediately becomes stuck even if it has drifted itself into a really shallow beach.
Occasionally if the beach is steep enough and there are waves you can get lucky, but its highly dependent on the waves at the time.