Lake Sassolo, Alps By Franco Banfi

'The water in the lake is freezing, so the best time to go is summer,' said Franco Banfi.
'But it's so different from a lot of other dives you could do around the world that it's well worth a visit.
'The other issue is altitude, it's hard work carrying diving eqipment and cameras around anyway, but when the air is thinner it becomes a real test of strength,' he added.