Grey sand at Sand Island Beach park

Kaiulani Moku-Paiva
Kaiulani Moku-Paiva

By Roger Mari - bio | email

HONOLULU (KHNL) Is it illegally dumped construction material or a naturally occurring substance in our ocean?

Along a pristine stretch of beach at Sand Island, a paddler saw and felt something underneath her feet after a routine day at practice.

"I noticed that the water was really murky, so I started sifting through the sand and I found all this grey junk was in the water," said Paddler Kaiulani Moku-Paiva.

She believes the gooey substance, which remains there today is concrete that was illegally dumped in the ocean. And now she worries it will impact the ocean reefs.

"It totally just dropped on all the rocks, now all the rocks in the water are starting to turn grey," said Moku-Paiva.

Stephen Swift has been working in construction for more than 30 years and used to recycle concrete. He believes he has solved the mystery.

"It's not concrete, this is Sand Island silt and clay, normally found all over the place down here," said Construction Worker Stephen Swift.

It has the feel and the look of concrete. But according to Stephen Swift, 3 days in water would be enough time for real concrete to cure.

"It would be hard and it would be solid, there's no solid pieces here at all," said Swift.

Whether or not it's concrete, one thing is certain. Only a certified geologist could explain the grey areas of this mystery.

In the meantime, this substance has made the crystal clear waters a murky mess, something that disappoints these paddlers every time they get in the canoe.

"It turns the water grey, and smoky and it looks really unsanitary, you don't even want to touch it," said Moku-Paiva.

While Swift says this is an ongoing natural occurrence, Moku-Paiva says it's the first time she had ever seen the grey substance near the shore.