It was a moment that rocked the sports world. On January 2 earlier this year Buffalo Bills safety Damar Hamlin made a routine tackle, but then collapsed on the field during a Monday night football game. He suffered "sudden cardiac arrest." Life saving measures included more than 20 minutes of on the field CPR. It's the reason Damar Hamlin is still alive today. Experts from across the country have come to San Diego this week for the Citizen CPR Foundation’s Cardiac Arrest Survival Summit. NFL Executive Vice-President of Communications and Policy Jeff Miller and Dr. Jonathan Drezner, team physician with the Seattle Seahawks, joined CBS 8's Heather Myers Wednesday in studio ahead of the conference.