china s olympics bubble will be the most ambitious covid quarantine ever attempted. cnn s david culver shows us how china is attempting to keep the games covid safe. reporter: traveling in beijing may prove to be a tougher race than an olympic competition. the winter games taking place in a capital city that feels like a fortress. determined to keep out any cases of new covid-19 starting at airport. this is a terminal used by athletes and the media arriving no beijing. they have a wall up that keeps the general population away from everyone who is part of the olympic arrivals. those coming in required to download this official app to monitor their health. inputting their information starting 14 days before arriving in beijing. while health surveillance and