There’s a cave off the mendocino coast you can get into at low tide, on a low wave. But you have to time your coming and going because even at low tide a wave will either whisk you in, or whisk you out, or smack you into the ceiling if you’re not on the same page as the wave.
Some time after going in and out, pulling the boat out for the day and having a beer I realized that was a really dangerous place, and a really really easy place to die if your timing was wrong. otherwise great fun!
