Just for grins S’man and I play a game of chicken. It’s a free dive challenge off the transom thru the murky waters below. The object is to reach ground zero (and return) grabbing a fistful of the clay like mud from the bottom as proof. The thrill is in the unknown depths where, even with eyes wide, it becomes very dark. More fear and less resolve as you leave the light; in another 8 feet it is blackness. Leaving the relative warmth of the surface therm it is ice cold. The pressure forces some water deeper into your nose and you can smell/taste the tannic acid. You know that you are close. You thrust downward thru the pitch in one last desperate grasp for the objective just as your exhausted lungs and nerves convince you to escape this deathly place.