A Muslim has died whilst training to be a Skydiver. The "BNP School of Diving" said they had no idea why his snorkel and flippers did not open.
Fins!!
Look. Those flippers that frogmen and other assorted diving/swpimpmping types use bear absolutely no resemblance whatsoever to the things you find on the sides of fish!
They are, however, uncannily like the things attached to the end of frog's legs (hence the term 'frogmen') and are not dissimilar to the things on the end of duck's legs and things on the sides of seals etc.
So - definitely not fins then! OK?