If it is shallow because it is above a quarter berth, then it is for things you want to quickly access like Joe Diver does. Cockpit coolers usually have a drain. Propane bottles are dangerous to keep in such places as they need to be in ventilated areas where they ventilate down. LPG is heavier than air and if they leak, the gas will go down into your cabin and possibly be fatal. If this cockpit locker is not totally sealed from the inside of the boat, as well as being vented downward, it is a potentially dangerous situation.