survivors. >> good samaritans dove beneath the surface to help. some freeing a teenage passenger, strapped to his seat. >> though didn't stop. up and down. >> couple of boats came over, guys came in trying to help the guys bring the people up. >> all five people on board were rescued, taken away in ambulances, 16 year old crushed to the hospital in critical condition. eyewitness hads to cash fuel, others still in shock, thinking how close this helicopter came to the visitors center's lawn. >> looked like the chop we are come over the land, tried to pull it back over the water, dropped maybe 10-foot off shore and sang like a rock. >> navy says it belong to aviation, which conduct helicopter tours. some eyewitnesses say they saw smoke coming from the back of that helicopter before it crashed. the fa a and the ntsb will