While neither a marine engineer or naval architect, I did spend last night at a Holiday Inn....Seeing that there were no portholes in the berth deck, yet assuming that at least part of it was above the waterline, would it be practicable to create an escape hatch in the hull [above the water line] that operated through a system of explosive bolts that could only be activated [manually] when a fire suppression system or fire alarm were activated? The hatch could be built flush with the exterior of the hull, with a reinforced interior frame, and would be an escape hatch of last resort.