U-Board pens for submarines, hardened shelters for warships, aircraft and ammunition depots. The cheapest and most effective air defense is a few meters of reinforced concrete. British Defense Secretary Wes Streeting declined to discuss reports of new shelters at Faslane, home of Britain's nuclear submarine fleet. The MOD has reportedly commissioned protective shelters at the base, recognizing the need for hardened aircraft shelters across RAF bases.

U-Board pens for submarines, hardened shelters for warships, aircraft and ammunition depots. The cheapest and most effective air defense is a few meters of reinforced concrete. British Defense Secretary Wes Streeting declined to discuss reports of new shelters at Faslane, home of Britain's nuclear submarine fleet. The MOD has reportedly commissioned protective shelters at the base, recognizing the need for hardened aircraft shelters across RAF bases.