Kaua’i is home to countless magnificent caves, and its Nā Pali Coast is where one of the world’s longest sea caves can be found. Aside from its length, the Double Door Cave at Waiahuakua Valley on Kauai’s Nā Pali Coast is also famous for its unparalleled, mystical beauty. When you’re on the island, experience this stunning wonder by exploring it on a sea cave tour.

What’s the Double Door Cave?

This landmark has earned its name for having two openings, one for entering and another for exiting. It’s also known as the Waiahuakua Cave or Sacred Water Cave. It’s shaped like a horseshoe and measures 1,155 feet long, making it one of the biggest features on the Nā Pali Coast.

What makes this landmark a favorite among sea cave tours is the lone hole in the ceiling of its western part. A waterfall cascades from the opening, offering a cool reprieve from the sunny expedition. When afternoon sun streams in, the hole creates a spotlight and spectators can witness mesmerizing, ghost-like swirls in the mist and light. These phantoms are calcium deposits, which are formed when fresh and salt waters are mixed.

Why You Should See It

The Double Door Cave is believed to be more than a million years old. It was created from volcanic eruptions and sculpted by crashing waves that carved its arches and ridges. What you see above water is only a fraction of its beauty. There’s a whole world underneath the surface that’s teeming with life. Depending on the season and weather conditions, sea cave tour guides allow passengers to snorkel and explore the deep blue underwater world.

If you want to explore the breathtaking Double Door Cave in Kaua’i, contact the team at Nā Pali Riders Raft Tours in Waimea, HI. These professionals offer a wide variety of ocean expeditions, including rafting, sightseeing, and snorkeling as well as dolphin and whale watching. All excursions are led by a skilled crew who is happy to share their knowledge about the land and sea with their passengers. Learn more about their sea cave tours online, or call (808) 742-6331 to book a reservation.