The Twitter user, claiming to be trawler/MTB operator Brian Davey, posted a picture of a giant metal cylinder online, saying that his friend had picked the thing up and asking others to identify the catch.
Some immediately recognised a parachute mine and pointed to its potential hazards.
However, there were those who still had their reservations.
Some netizens suggested a small and cynical experiment to find out what the thing was.
Others provided life-saving advice or put forth their amusing guesses.
The original poster didn’t keep fellow netizens in the dark about the fate of the find.
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According to the local outlet Plymouth Live, the suspected torpedo was brought up by a small trawler from the seafloor off the Devon town of Brixham, which resulted in partial shutdown of the village. The boat’s skipper reported his catch to the Royal Navy EOD, who worked on the incident along with police and the coast guard.
The “torpedo”, which was also described as a mine and a fuel tank, was eventually blown up out at sea. The local police have posted footage of the detonated “parachute mine” on their social media account.