Above & Under

In most of the beaches of Hiiumaa water is not deep at the coast and suitable for swimming even for youngest members of family.
However, it is not always like that. 
It is easy to guess, how fast water is getting deeper. 
Mostly the sea bed just copies land on coast.
So, if the beach is sandy and flat, the ground under waves is probably the same.
If you are in Ristna and rush down to sea from 5-8 m high bank, you should remember, that ground under waves disappears as fast as coast rises from sea.