Yes, they're prepared to defend against enemy combat divers placing mines. *In peacetime, they defend against enemy infiltrators gathering intelligence. There'

Yes, they're prepared to defend against enemy combat divers placing mines. *In peacetime, they defend against enemy infiltrators gathering intelligence. There's a long history of combat divers, or frogmen: https://en.wikipedia.org/wiki/Decima_Flottiglia_MAS https://en.wikipedia.org/wiki/Decima_Flottiglia_MAS https://en.wikipedia.org/wiki/Lionel_Crabb https://en.wikipedia.org/wiki/Lionel_Crabb https://en.wikipedia.org/wiki/Operation_Frankton https://en.wikipedia.org/wiki/Operation_Frankton There are many such stories. One of my favourites is of the jovial, slightly portly Italian diplomat Luigi Ferraro (in reality a frogman under diplomatic cover) during WW2 in neutral Turkey, who at night would go out to a nearby port, swim out and place limpet mines on British ships transporting vital chrome for steelmaking to Britain. Yes, let's go assemble high explosive timed devices, alone, then swim, at night, and place the devices on defended enemy ships. He sank three.