This is an automated archive made by the Lemmit Bot.

The original was posted on /r/todayilearned by /u/Maleficent-Agent-477 on 2026-05-22 02:25:03+00:00.

Original Title: TIL that during nuclear testing in 1957, an explosion was detonated 500ft underground and released a force 50,000 times greater than expected. This caused a 900 kg (2000lb) manhole cover to pop off and be launched into the atmosphere and likely vaporized, where it was never found.