The device detonated in the Mike ("megaton") test, called the Sausage, was the first H-Bomb ever tested, built upon the Teller-Ulam principles of staged radiation implosion. The 10.4Mt device used two stages, with a fission bomb as the primary, and a secondary stage of liquid deuterium fuel in a cylindrical Dewar. The Dewar was surrounded by a natural uranium pusher/tamper weighing 5 tons. The steel housing was 2m wide and 6.1m long, with walls 30cm thick. The inside surface of the casing was lined with sheets of lead and polyethylene to form a conduit from the primary to the secondary. The entire device weighed 82 tons making it entirely impracticle as a deliverable weapon. The island the test device was situated on was obliterated, the resulting crater was 1.9km wide and 50m deep.