The 5.4-ton Tallboy bomb was found in September 2019 beneath a waterway leading to the port of Szczecin, in the northwest of the country.
Navy demolition experts attempted to neutralise it on Tuesday 14 October 2020, but - as the video shows - the bomb containing 2,400kg worth of explosives went off, causing a huge blast.
Thankfully, things could have been a lot worse, with Navy spokesman Lieutenant Commander Grzegorz Lewandowski confirming nobody was hurt.
