Magical mystery tour

You feel very honoured when a friend lets you in on a secret. Today we were taken to a special place that my friend had come across by chance. We shall call it the Black Lagoon....and say only that it is somewhere in the darkest South Hams. It was somewhat eerie and seemingly bottomless, or, 'as deep as a cathedral' according to someone who lives nearby. As we swam we occasionally saw columns of bubbles, like silver coins floating up from the deep.