Doubledolphins
Submariners don't wear "Underwater Wings" they are Dolphins, or a pair of lady's legs if you look again.
VMT DD but "Underwater wings" in inverted commas (or "speechmarks", as some young fellows quaintly call them!) is a very old joke dating back to 16 Jul 71, the date RN dolphins were first awarded. RAN dolphins were previously always known as the D of E's view of a certain lady wearing nylons, and hence the RN's more heraldic dolphins quickly became known as the D of E's view of the same lady wearing fishnet stockings.
Jack
PS I'm much too polite to comment on the location of the anchor ....