Properties may or may not be listed by the office/agent presenting the information floor and reinforcements for superior strength, Strong, 1/4 structural steel surrounds exterior to resist ground pressures, Proprietary pressure tested to ensure no leaks, Structural extended floor uses earth above to provide over 20,000 pounds to keep the shelter from floating, Triple-locking, single-lever latching mechanism with keyed door handle, Gasketed door with spring-loaded assists for easy opening and closing with Durable twin springs to provide zero weight door, Plumbing and electrical connection hookups for added functionality. This underground tornado storm shelter uses a vertical stair ladder uses bench seating all the way around the sides of this contained unit to maximize its 10x6ft spacing. Subterranean homes give you a steady all-year round temperature.