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The Nereus engineering team knew that, to reach these depths, a tethered robot using traditional technologies would be prohibitively expensive to build and operate.

used unique technologies and innovative methods to strike a balance between size, weight, materials cost, and functionality.

Building on previous experience developing tethered robots and autonomous underwater vehicles (AUVs) at WHOI and elsewhere, the team fused the two approaches together to develop a hybrid vehicle that could fly like an aircraft to survey and map broad areas and then be converted at sea into a tethered, remotely operated vehicle (ROV) that can hover like a helicopter near the seafloor to conduct experiments or to collect biological or rock samples under real-time human control.

The tethering system presented one of the greatest challenges in developing a cost-effective ROV capable of reaching these depths.

If such a cable were used to reach the seafloor in the Mariana Trench, it would snap under its own weight.

To solve this challenge, the Nereus team adapted .. to carry real-time video and other data between the Nereus and the surface crew

Similar in diameter to a human hair and with a breaking strength of only 4 kilograms (8.8 pounds), the tether is composed of glass fiber core

Another weight-saving advance of the vehicle is its use of ceramic spheres for flotation, rather than the much heavier traditional syntactic foam used on vehicles like the submersible Alvin or the ROV Jason. to withstand crushing pressures.

make effective use of the vehicle's limited battery power.

It allows vast areas to be explored with great effectiveness.

but unleashing a capability that now enables deep exploration, unencumbered by a heavy tether and surface ship,

A one-hour documentary produced by Discovery Studios will air on Science Channel

we’re eager for Nereus to become widely used to explore the most inaccessible reaches of the ocean

its primary mission is to understand the oceans and their interaction with the Earth as a whole, and to communicate a basic understanding of the oceans’ role in the changing global environment.

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