When a vehicle gets stuck in deep, soft sand you use a pair of sand ladders to give it a firm surface to drive onto. You dig out a bit in front of the drive wheels, lay the ladders down to make a very short roadway, then with a bit of pushing and gentle throttle, you drive onto them. Usually you can keep going off the other end without getting stuck again, leaving the co-driver to run after you with a shovel and 2 sand ladders. How far you go before you risk stopping to let him catch up? ... well there's always the risk of you being the one left behind with the sand ladders next time...