Reconnaissance robots that can be lobbed 148 feet over walls, or into buildings and caves to provide real-time video have been tested by the Royal Marines. The 43 Commando Fleet Protection Group have been trialling the'throwbots' -- and other advanced kit -- during exercises around and in the tunnels beneath Gibraltar. The bots are built to survive falls of up to 32 feet, automatically self-right after landing and can operate for 30 minutes when submerged under 3 feet of water. Marines could throw the robots into unknown or occupied territory in order to get an advanced'lay of the land' without putting themselves directly at risk. When not testing new field tech, 43 Commando's responsibilities include protecting the UK's nuclear weapons arsenal at Her Majesty's Naval Base, Clyde, in Scotland.