The GBU-37 (Guided Bomb Unit 37) Paveway IV is a smart anti-bunker bomb developed and produced by Raytheon for the British Royal Air Force. Guided by laser and GPS, it is capable of plowing through 35 ft (11m)-thick of reinforced concrete before detonating inside bunker to destroy target. In service since 2008, the GBU-37 replaced the GBU-27 and has been dropped from Tornado and Typhoon fighter aircraft. The bomb has a total weight of 500 lb (227kg).
