Marker Pipes

Here the pipe on the inside is visible during the low tide









But as you can see here, the inside pipe is not visible due to the high tide









And here just the tip of the pipe wrapped by white reflective tape. You may have to zoom in on the picture to see just the tip of it. The pipe is used to mark where the channel is so when you're out in the ocean beyond the reef and you are on a SUP board or a kayak, you'll know the deepest waters to get back in front of the reef. It was recently sleeved by Gilbert R. from Waialua/Makaha/Faria Beach area

And NO, IT IS NOT A VENT FOR OUR SEWAGE! I was just kidding.