Three military dolphins trained to kill enemy divers using knives and guns attached to their heads are reported to have escaped from the Ukrainian navy, apparently in a quest to find love with a group of females.
Some reports by Ukrainian and Russian media suggest that the dolphins still have firearms attached to their skulls, although this is being denied - in fact the Ukrainian Defence Ministry has denied that the military-trained dolphins even exist, yet alone have escaped.
More recent reports claim the story is a hoax. A news update in The Atlantic - which originally ran the story as factual - now says it was started by a museum director.
However, hoax or not, as a general safety precaution in the future: If you do happen to be swimming in the sea and come across dolphins with guns or knives strapped to their heads, it might be best not to approach them...
Why not take out a subscription to Practical Fishkeeping magazine? See our latest subscription offer.
Don't forget that PFK is now available to download on the iPad.