A young man tried to walk through the sea from Blackrock to Howth as it looked "so close" and he believed the water to be shallow enough to walk the whole way.
The distance across the sea is approximately 12km, in a straight line, but the route crosses Dublin Bay which has a depth of over seven to 20 metres to allow large ships to pass through.
He made it almost halfway there before he had to turn around as he found himself out of his depth.
