Woods Hole Oceanographic Institution | 2018

Woods Hole Oceanographic Institution

Exploring the ocean’s vast twilight zone, teeming with undiscovered life and solutions for climate change

The twilight zone is a mysterious part of the ocean that may hold a million new species, and 90 percent of the world's fish biomass. Woods Hole hopes to explore the region — before commercial fishers do.

Relevant Stats

Paragraph introducing any relevant stats.



The problem

The ocean’s twilight zone, known to scientists as the mesopelagic or midwater region, sits beyond human sight, about 200 to 1,000 meters beneath the surface. The sun in the twilight zone is barely a glimmer, but the region is teeming with life. In fact, the twilight zone is believed to be home to more than one million new species, and up to 90 percent of the world’s total fish biomass. The world’s largest animal migration takes place here every day. Yet, the region has been largely unexplored.

Big idea

Woods Hole Oceanographic Institution (WHOI) is launching a mission to explore the twilight zone, a globe-spanning ecosystem that is deeply intertwined with the entire marine food web and even Earth’s climate system. The goal is to understand how the extraction of resources from this zone might affect it in ways that could reverberate throughout the ocean and around the world, for centuries to come. Commercial fishing interests are scaling up efforts to harvest the twilight zone, despite our lack of knowledge about the region and its inhabitants. WHOI’s mission comes at a crucial time to advance human understanding of this vast frontier.


With this mission, WHOI aims to form a new body of knowledge that will promote responsible stewardship of the ocean and shed new light on how our planet works. WHOI's scientists, engineers and technicians are doing this by continuing their groundbreaking work developing new generations of smart robots and other tools necessary to explore the zone. The mission began by deploying autonomous underwater vehicles and sensors in the Atlantic Ocean, offshore from the recently created Northeast US Shelf Long-Term Ecological Research (LTER) site. Subsequent cruises have conducted research in the Northeast Pacific and off the coast of the Bahamas.  The stage is now set to open the twilight zone to comprehensive study, laying the groundwork for a network of hardware, software and data throughout the ocean worldwide.

Why will this succeed?

Exploring the twilight zone demands unprecedented depth and breadth of experience, and WHOI researchers have a long track record of pioneering ocean research, as well as experience building novel robots and sensors. They are a leading voice in ocean science and exploration, and their ability to conceive, build and deploy new underwater technologies is unparalleled. The twilight zone sits largely beyond national jurisdiction and holds massive potential for commercial fishing, which puts it at risk of unregulated extraction. The data collected by WHOI will help fuel smart policies that support sustainable use of the twilight zone in locations all around the world.

Project Impact

Recent Updates

Deep See thumbnailDeep See thumbnail

WHOI blog

WHOI’s journey to the ocean’s twilight zone begins

WHOI’s journey to the ocean’s twilight zone begins

Tests of a new vehicle called Deep-See will begin to build a detailed picture of life below the sunlit surface of the ocean.

July 17, 2018
squidworm thumbnail newsquidworm thumbnail new

Science Magazine

What lives in the ocean’s twilight zone? New technologies will tell us

What lives in the ocean’s twilight zone? New technologies will tell us

The sea's murky depths might host more life than we thought. That's the preliminary conclusion of scientists who this week completed the inaugural cruise of the Ocean Twilight Zone (OTZ) initiative.

August 23, 2018

Submit your idea

Does your bold vision have the potential for far reaching social impact?

Learn if you qualify