Not that I ventured very deep inside. I pretty much remained in one wonderfully decorated room just beyond the cavern zone, away from the main line, shortly following a rarely traveled secondary line to a small cenote located not that far on the other side of the road.
As therapy I played around with my TillyTec lights, shooting various trial clips and experimenting with macro photography.
Grand cenote being relatively deserted today, I finished my dive with a tour of the cavern zone, enjoying the play of sunlight streaming in.