 The group calls themselves the Amersham Ambushers, a reference to the London suburb they're all from. They had unsuccessfully tried the so-called London Tube Challenge twice before, but the third time was the charm. 18 hours. 18 hours. That's a full day. Would you say 272 stops? That's correct. Man. Thank you, Dom. 22 minutes now after the hour. On this morning, America's First News.