. >> reporter: cave diving expert mark messersmith is watching the rescue from florida. >> i am excited to see what the guys are doing. i continue to pray for great success. >> reporter: messersmith not only teaches people how to cave dive. he has also rescued stranded divers before. his videos stress safety under water. >> to keep his hands free, he pressed his fins against the cave entrance wall or leaned in with his shoulder. >> reporter: instead of a traditional scuba diving mask and regulator messersmith believes the divers will use a full face mask on the boys to keep them from panicking under water. >> the biggest thing is to get them to relax, breathe as normal, and trust the rescue divers. >> reporter: the danger remains far from over. >> hopefully everybody will come out safe and sound and we'll see this probably in a movie in a few years. >> reporter: messersmith says he is hopeful considering that a group of expert cave divers are on scene leading the operation from uk. he calls them world class and the best of the best. >>> 2020 will air a special edition at 9:00 tomorrow o