"The U.S. military has its own stratospheric spy balloon program."
"stratospheric balloons are colossal. ... you could fit en entire football stadium inside one."
"Attempting to let the air out by punching a few holes is like expecting to ventilate an entire warehouse with fresh air by opening one small window."
"Large balloons are hard to shoot down. ... In 1998 a rogue Canadian weather balloon drifted towards Russian airspace. Fighter jets from Canada, Norway and Sweden attempted to bring it down without success. Two Canadian air force CF-18 fighters hit the balloon with more than 1,000 rounds of 20mm cannon fire off the coast of Newfoundland, riddling it with holes. This was not enough to let a significant amount of gas out, and the balloon continued drifting."