DRONE VIDEO: CLICK ON THE PHOTO AND ALLOW IT TO BUFFER A BIT
When the drone moves over to look more straight into this tunnel, I think there is a bit of an optical illusion: It appears that the tube disappears in distant blackness, but I think what really happens is that there is a large, black rock in the center with a little back-lighting above and to your right from behind the rock. It's obvious from the view from the "front" of Second Grotto that this does tunnel all the way through, so there just about has to be "light at the end of the tunnel," even though it's difficult to tell from the video.
When we fly over to the little "beach pocket," that is the Old Man by the Sea area, with a view of the back side of the Old Man.
If you would like to see more drone footage from the "front side" of Second Grotto, click below:
https://www.optimimagery.com/THIS-IS-ME-Vacations-around-Sa/CNMI-ON-LAND/SAIPAN-2019/NOVEMBER-11-2019-DRY-GROTTO/
