Really sad. No information on why they were there.
People who go out to sea in boats wear layers of insulation, wetsuits or drysuits, lifejackets and other safety gear, together with lots of rules about how quickly people need to be pulled out if they do go in.
Meanwhile, I see people, often older women, swimming in very cold seas in nothing but a swimsuit regularly. If they were swimming then it should be a prompt for a serious discussion about whether this sort of thing is a good idea.