This photo shows a 65 undergoing Coast Guard stability testing, using a small army (50 people) as moveable ballast. Notice that the waterline stripe is still visible, even with this excessive load.
There are two watertight bulkheads. The forward bulkhead is at the rear end of the anchor locker. The aft bulkhead is under the steering pedestal. Other safety features include non-skid deck surfaces, strong lifelines, bow and stern pulpits, self bailing cockpit, and secure hatches and ports. The non-skid deck surface has enough tooth to insure good footing, yet it is not so rough as to tear up your skin.