Stuck in the groyne

A few days away on the coast. Will be more photos to come.
They day started quite bright and sunny, but by the time we had bought provisions, the cloud and come over somewhat. 
These rocks, boulders and pebbles were all crammed into a small space in the groyne. The largest pieces must weigh the same as a grown man, yet, the sea tosses them around like a plaything to get them stuck like this.