The 1965 Chagan nuclear explosion was part of Russia’s Nuclear Explosions for the National Economy program. The idea was to use nuclear explosions for peaceful civil engineering projects. The 140 kiloton explosion created a 100 metes (328 ft) deep lake and dammed a nearby river.
Oppenheimer and General Leslie Groves inspect the melted remnants of the 100-foot steel tower that held the Trinity bomb. Ensuring that the testing of a bomb with unknown strength would remain completely secret, the government chose a location that was so remote they had to import their water from over 150 miles away.
An underwater nuclear test being conducted during Operation Dominic, Pacific Coast off California; ca. May 11th 1962
This isn’t even the impressive part. The impressive part comes right afterwards…
Watch this video of the explosion:
Here is a video of the shot. It was the fifth largest nuclear shot by the US ever, at 9.3 megatons. It really does look like a sunrise/set (only at 1000x speed).
(I recently read Command and Control, would recommend it, covers a lot of the insanity regarding nuclear weapons. Apparently, up until the 80’s they were surprisingly easy to to set off, none of the PAL stuff you see in movies these days. Right after World War Twi they were still trying to figure out how to work nuclear war into scenario planning, it leads to a lot of crazy phrases like “limited nuclear war” or “progressive escalation” in terms of how to use the weapons not just against the soviets but also against weaker world powers. I think the USA did get a bit of a God complex for a bit, but once the cold war started it balanced it out to a more muted insanity and paranoia as they realized that just about any major power could drop a nuke and it might just set off the rest of the world, intentional or not…)
Children practice the “Duck and Cover” drill, to protect themselves against the effects of a nuclear explosion, 1950s
Duck and Cover is a method of personal protection against the effects of a nuclear explosion, which the United States government taught to generations of United States school children from the early 1950s until the end of the Cold War in the late 1980s. It was intended to protect them in the event of both an unexpected nuclear attack, which, they were told, might come at any time without warning and in the event sufficient warning is given.
Under the conditions of a surprise attack, immediately after they saw a flash they had to stop what they were doing and get on the ground under some cover—such as a table, or at least next to a wall—and assume a prone like position, lying face-down and covering their exposed skin and back of their heads with their clothes, or if no excess clothes such as a coat was available, to cover the back of their heads with their hands. Similar instructions were given in 1964 in the United Kingdom by Civil Defence Information Bulletin No. 5. and, in the 1980s, by the Protect and Survive series. Under the conditions where sufficient warning is given, they were told to find the nearest Civil Defense shelter, or if one could not be found, any well built building to stay and shelter in. From Wikipedia