Boy and grandad discover the wonder of the natural world as they help to free a baby seal.
It's a warm summer's day, so Boy and his grandad pack up their provisions and head for the seaside.
There's so much to do, from exploring rock pools to building a magnificent sandcastle. But their day takes a different turn when they go for a swim and find a baby seal caught up in a net. Its rescue leads Boy and Grandad on a thrilling underwater adventure!
