DEEP selects Tennessee Reef for subsea habitat deployment

Ocean engineering company DEEP, Bristol, U.K., has selected Tennessee Reef in the Florida Keys National Marine Sanctuary as the deployment site for Vanguard, the company’s pilot subsea human habitat scheduled for installation in April 2026. The project will mark the first subsea human habitat deployed in U.S. waters in more than 40 years.

Final permits for installation within the sanctuary were granted in March 2026. Installation is planned for late April, weather permitting, and will involve a multi-stage marine operation to install the habitat foundation and surface support systems.

First unveiled in Miami in October 2025, Vanguard is currently in the final stages of commissioning, including outfitting, subsystem testing, and integrated acceptance trials. The habitat is designed to support up to four aquanauts living and working underwater for extended periods, enabling long-duration ocean research, monitoring, and conservation work.

The subsea habitat concept is closely tied to saturation diving operations, where divers live in a pressurized environment matching underwater depth, allowing them to work for extended periods without repeated decompression cycles. By maintaining pressure equilibrium, aquanauts can spend days on the seafloor instead of minutes, improving productivity for subsea construction, scientific research, infrastructure inspection, and offshore energy work. The habitat model is also being explored for applications including coral reef restoration, offshore wind farm maintenance, pipeline and subsea cable inspection, and long-duration ocean science missions.

“Tennessee Reef provides Vanguard with a home in one of the world’s most important marine environments,” said Norman Smith, chief technology officer at DEEP. “Seeing Vanguard deployed and ready to host aquanauts underwater will mark the start of a continuous human presence on the seafloor, in service of science, learning, and ocean stewardship.”

DEEP said it selected Tennessee Reef based on environmental, operational, and research considerations. The reef lies within a controlled-access conservation area and provides access to coral reef systems as well as deeper surrounding waters suitable for scientific research. Benthic surveys identified a sand patch suitable for deployment that avoids living coral and other sensitive marine resources.

Vanguard will be operated from DEEP Station Florida, a shoreside base in Marathon in the Florida Keys. The facility will support habitat operations, aquanaut training, and emergency response. The proximity of the base to the habitat site is intended to support aquanaut evacuation protocols and provide access to hyperbaric medical equipment.

The company is working toward making Vanguard the first subsea habitat to be classed by DNV, which has provided independent technical oversight during design and development.

The habitat will be installed on a foundation at a depth of approximately 18 meters (59’), with the living module positioned at about 14 meters (46’). The structure consists of a steel habitat with acrylic windows mounted on a baseplate and connected to a tethered surface support buoy.