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Marine Mysteries · 2026-03-10 · 6 min read

The Deep Things in Puget Sound: Giant Octopus and Unknown Creatures

Puget Sound's deep channels harbor the world's largest octopus — and possibly things we haven't classified yet.

The cold, dark waters of Puget Sound plunge to over 900 feet in places — deeper than many ocean trenches. These frigid depths are home to the Giant Pacific Octopus, the largest octopus species on Earth, with arm spans exceeding 20 feet.

But divers and fishermen in the Olympia area have reported encounters with something far larger. In the deep channels near the Nisqually Reach, sonar readings have captured massive biological signatures — objects 40-60 feet in length that move with purpose and intelligence.

The Squaxin Island Tribe has oral histories spanning thousands of years that speak of enormous creatures in the deep inlets. They describe beings that could capsize canoes and drag fishermen into the darkness.

Commercial divers working on the Olympia waterfront have reported seeing eyes — large, intelligent eyes — watching them from the murky depths at the edge of their lights.

"The Sound is an inland sea," Captain Ron notes. "We've explored less than 5% of its deep channels. What lives down there? We honestly don't know. And that should terrify and excite you."

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The Deep Things in Puget Sound: Giant Octopus and Unknown Creatures
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The Deep Things in Puget Sound: Giant Octopus and Unknown Creatures

2026-03-10 6 min

The cold, dark waters of Puget Sound plunge to over 900 feet in places — deeper than many ocean trenches. These frigid depths are home to the Giant Pacific Octopus, the largest octopus species on Earth, with arm spans exceeding 20 feet.

But divers and fishermen in the Olympia area have reported encounters with something far larger. In the deep channels near the Nisqually Reach, sonar readings have captured massive biological signatures — objects 40-60 feet in length that move with purpose and intelligence.

The Squaxin Island Tribe has oral histories spanning thousands of years that speak of enormous creatures in the deep inlets. They describe beings that could capsize canoes and drag fishermen into the darkness.

Commercial divers working on the Olympia waterfront have reported seeing eyes — large, intelligent eyes — watching them from the murky depths at the edge of their lights.

"The Sound is an inland sea," Captain Ron notes. "We've explored less than 5% of its deep channels. What lives down there? We honestly don't know. And that should terrify and excite you."

Puget Sound Giant Octopus Sea Creatures Olympia