Oussama Khatib held his breath as he swam through the wreck of La Lune, 100 meters below the Mediterranean. The flagship of King Louis XIV sank here in 1664, 20 miles off the southern coast of France, and no human had touched the ruins – or the countless treasures and artifacts the ship once carried – in the centuries since. With guidance from a team of skilled deep-sea archaeologists who had studied the site, Khatib, a professor of computer science at Stanford, spotted a grapefruit-size vase. He hovered precisely over the vase, reached out, felt its contours and weight, and stuck a finger inside to get a good grip. He swam over to a recovery basket, gently laid down the vase and shut the lid.

Stanford's five-foot "virtual diver" was originally built for studying coral reefs in the Red Sea where a delicate touch is necessary, but the depths go well beyond the range of meat-based divers. The "tail" section contains the merbot's onboard batteries, computers and array of eight thrusters, but it is the front half that looks distinctly humanoid with two eyes for stereoscopic vision and two nimble, articulated arms. Those arms are what make OceanOne ideal for fragile reef environments or priceless shipwrecks like La Lune, which sank off the coast of France over 350 years ago and hasn't been touched until now. Force sensors in each wrist transmit haptic feedback to the pilot, allowing them to feel the object's weight while staying high and dry on a dive ship. The robot's "brain" works with the tactile sensors to ensure the hands don't crush fragile objects, while the navigation system can automatically keep the body steady in turbulent seas.

Yemeni government troops newly-trained by a Saudi-led coalition battling Yemen's Shiite rebels routed al-Qaida militants on Friday from a city in the country's south, military officials said. Houta, the capital of Lahj province, is now firmly under government control, the officials said. The coalition-trained troops, which are loyal to Yemen's internationally recognized government, were based in the southern Al-Anad base from where they launched the fight to retake the provincial capital, they added. The officials said the militants fled on Friday from Houta to nearby towns and farmland. The assault came at a time the coalition helicopters and U.S. drones have waged series of airstrikes targeting al-Qaida hideouts and strongholds across Yemen's southern region.

Over the past several decades, the United States has been an aggressive first mover in a war-fighting regime centered on guided munitions and integrated battle networks. These innovations have allowed U.S. forces to operate relatively uncontested in space, in the air, and on and under the sea, and to dominate conventional force-on-force land combat. For a variety of reasons – the geopolitics of rising powers, the global diffusion of technology and counter-reactions by its adversaries chief among them – the preeminence enjoyed by the United States in this regime is starting to erode. It's an amazing document for which this first sentence barely does justice for what is revealed throughout. So, once again we are given a DARPA press release of sorts that covers a program supposedly in development.

The US has officially christened its experimental self-driving warship designed to hunt for enemy submarines for months at a time. The 132ft-long (40-metre) unarmed prototype, dubbed Sea Hunter, is the naval equivalent of Google's self-driving car, designed to cruise on the ocean's surface without a crew. The ship's projected 20 million ( 14.2 million) price tag and its 15,000 ( 10,650) to 20,000 ( 14,300) daily operating cost make it relatively inexpensive for the navy. The 132ft-long (40-metre) unarmed prototype, dubbed Sea Hunter, is the naval equivalent of Google's self-driving car, designed to cruise on the ocean's surface without a crew. The ship's projected 20 million ( 14.2 million) price tag and its 20,000 ( 14,300) daily operating cost make it relatively inexpensive for the navy The vessel was unveiled by Deputy US Defense Secretary Robert Work and has been developed by the Pentagon's Defense Advanced Research Projects Agency (Darpa).

PORTLAND, OREGON – The U.S. military on Thursday christened an experimental self-driving warship designed to hunt for enemy submarines, a major advance in robotic warfare at the core of America's strategy to counter Chinese and Russian naval investments. The 132-foot-long (40-meter-long) unarmed prototype, dubbed Sea Hunter, is the naval equivalent of Google's self-driving car, designed to cruise on the ocean's surface for two or three months at a time -- without a crew or anyone controlling it remotely. That kind of endurance and autonomy could make it a highly efficient submarine stalker at a fraction of the cost of the Navy's manned vessels. "This is an inflection point," Deputy U.S. Defense Secretary Robert Work said in an interview, adding he hoped such ships might find a place in the Western Pacific in as few as five years. "This is the first time we've ever had a totally robotic, trans-oceanic-capable ship."

The six astronauts at the International Space Station got an early Easter treat this weekend with the arrival of a supply ship full of fresh food and experiments. Instead of the usual bunny, Saturday's delivery came via a swan -- Orbital ATK's Cygnus capsule, named after the swan constellation. The cargo carrier rocketed away from Cape Canaveral on Tuesday night. NASA astronaut Timothy Kopra used the station's big robot arm to grab the capsule, as the two craft soared 250 miles above the Indian Ocean. Four hours later, the capsule was bolted firmly to the complex.

The six astronauts at the International Space Station got an early Easter treat this weekend with the arrival of a supply ship full of fresh food and experiments. Instead of the usual bunny, Saturday's delivery came via a swan -- Orbital ATK's Cygnus capsule, named after the swan constellation. The cargo carrier rocketed away from Cape Canaveral on Tuesday night. NASA astronaut Timothy Kopra used the station's big robot arm to grab the capsule, as the two craft soared 250 miles above the Indian Ocean. Four hours later, the capsule was bolted firmly to the complex.

The six astronauts at the International Space Station got an early Easter treat this weekend with the arrival of a supply ship full of fresh food and experiments. Instead of the usual bunny, Saturday's delivery came via a swan -- Orbital ATK's Cygnus capsule, named after the swan constellation. The cargo carrier rocketed away from Cape Canaveral on Tuesday night. NASA astronaut Timothy Kopra used the station's big robot arm to grab the capsule, as the two craft soared 250 miles above the Indian Ocean. A Russian cargo ship will lift off Thursday, followed by a SpaceX supply run on April 8. NASA has turned to private industry to keep the space station stocked.

An unmanned spacecraft carrying 6,300 pounds of supplies and science experiments caught up Saturday morning with the International Space Station as it flew 252 miles above the Indian Ocean. The Cygnus spacecraft, made by Dulles-based Orbital ATK, had launched late Tuesday from Cape Canaveral on its journey to the orbiting laboratory. Flying at more than 15,000 mph, the spacecraft was captured by the station's robotic arm at 6:51 a.m. Eastern in what a NASA official called a "textbook rendezvous." The spacecraft was launched atop an Atlas V rocket that Oribtal ATK hired from the United Launch Alliance, the joint venture between Lockheed Martin and Boeing.