The loch can change so quickly. It was pretty calm, but there are strong undercurrents that could have caused the boys a lot of problems especially if they weren't experienced sailors.

Is it safe to kayak on Loch Lomond?

The spectacular waters of Loch Lomond are fantastic for canoeing and kayaking with the lochs many islands providing interesting bays and narrow straights to explore. ... Access to open water paddling by canoe or kayak is particularly good within the Queen Elizabeth Forest Park too.

Is it safe to swim in Loch?

Apart from the small matter of Nessie lurking deep beneath the surface, the water is bitterly cold all year round – only around 5°C. In these low temperatures, you will quickly get hypothermia. So, in other words, wild swimming in Loch Ness is very dangerous!