An unexpected find on the Beara Peninsula (the one tour buses aren’t allowed on). It involved a crazy drive even by Irish standards, but was well worth it. We hiked after visiting and when we came back by two hours later the tide had come in so much the caves were inaccessible.
Exploring the cave before high tide. 
Sea urchins live in the cracks. 
A short time later, you needed boots to get in.
Lou Whiteman 