Swim-through that's actually nice, sink slowly into a hole, becomes open-roof deep canyon with sandy floor 10s of feet below. Side canyon depth to ~95', not that we did that.
Great sponge shapes on the wall. Big barrel opening downwards, big barrel with most of bottom gone like that redwood stump in Corte de Madera.
Horse-eye jacks in 2nd canyon.
New reg weird? Much higher air consumption this day.