Yields from the weapons were 1 kiloton, 6 kilotons and 25 kilotons respectively. The Pershing Ia missile was armed with a 400 kiloton W50 warhead. A 20 kiloton warhead was detonated in a lagoon which was approximately deep. The maximum power for the nuclear warhead is 50 kiloton TNT (Iskander-M). It involved detonation of a 5.3 kiloton device at a depth of . The remaining three tests were of 300 kiloton warheads in 1962. The W-31 warhead had four variants offering 2, 10, 20 and 30 kiloton yields. The "kiloton (of TNT)" is a unit of energy equal to 4.184 terajoules (). At this point they were each armed with a single 60 kiloton nuclear bomb. MC' (Medium Capacity) referred to a nuclear weapon in the kiloton range. A 3.5 kiloton underwater test was performed with the torpedo on September 21, 1955. The device had a 70 kiloton yield. A kiloton of TNT can be visualized as a cube of TNT on a side. All other tests had a kiloton yield. These uncertainties may result in slight, unintended breaches of the 150 kiloton threshold.