The Emergency Exit
The Mini Rule requires that every boat have an escape hatch in the stern which allows the solo sailer to get out if the the boat is overturned. The life raft is kept inside, in front of the hatch, so the sailer can take it with him when exitting from the capsized boat.
The Mini Rule also requires that that the boat must have a mimimum of 1200 litres of foam inside the hull, thus making the 850 kg boat insubmersible in case of a leak.