Lander (spacecraft) a landing which should have come on 25 December 2003 was not received. Indeed, no communication was ever established and "Beagle 2" was declared lost on 6 February 2004. The proposed 2009 British Beagle 3 lander mission to search for life, past or present was not adopted. The French/ESA NetLander mission for 2007 or 2009, with an orbiter and 4 landers, was cancelled because it was too expensive. Its successor, Mars MetNet, a multi-lander mission for 2011–2019 was not adopted by the ESA. The American Mars Exploration Rovers "Spirit" and "Opportunity" were launched in June and July 2003. They reached
Lander (spacecraft) any other or separate mission. Also, another proposal calls for a large nuclear-powered "melt probe" (cryobot) that would melt through the ice until it reached an ocean below where it would deploy an autonomous underwater vehicle (hydrobot) that would gather information. The Deep Space 2 impactor probe was to be the first spacecraft to penetrate below the surface of another planet. However the mission failed with the loss of its mother ship, Mars Polar Lander after communication was lost after entry into Mars atmosphere on 3 December 1999. Comet Tempel 1 was visited by NASA's "Deep Impact" probe on 4