The tunnel starts maybe 15 yards from the water and ends at the water's edge. When the surf is rough this would not be a good place to be. In fact, I have started to walk through it on several trips when the surf was reasonably calm only to get half way and then chicken out. You can't see just "around the bend." Also, there are lots of little air channels surrounding you as you walk into the tunnel, so with each wave you hear hissing and groaning on all sides. For me, even when I KNOW that the waves are small enough that this is a safe trip, it spooks the bejeebers out of me.
On this date the seas were very calm and the tide was just beyond high (starting back down). I knew that there was no way any waves could come up here, so I decided to finally go for it. This video and the next photo are from the landward end.
Make sure that your sound is on. Click on the triangle. Let it buffer a bit.