Missing nuclear material or a gas leak could be behind the spate of drone sightings in recent weeks, an expert has suggested.

And potentially outside the atmosphere, to wit: we present his reaction control gas thruster-controlled drone. Before anyone gets too excited, [Tom] isn’t building drones for use in a vacuum ...

The hydrogen remains stable and solid in these structures until "coolant" is pumped through the tubes, warming them and releasing hydrogen gas to the drone's fuel cell Hydrogen (H2) is pumped into ...

The Ukrainian Navy has released footage which it claims shows Russian-controlled gas platforms off the coast of Crimea being targeted by unmanned surface vehicles, or sea drones. The unverified ...