Why This Stuff Costs $2700 Trillion Per Gram - Antimatter at CERN

Doctor, two questions that bothers me, first how did an antimatter particle generated a gas trail without being obliterated at the first bubble, second supposedly there could be some relativistic time stretch that let the particle survive a long trail, but at the very least at the end of the trail there should be a bigger bubble, a pop! when the particle finally meets its nemesis.