And we begin tonight with that developing story, word of a crash at sea and a stunning rescue. A Marine Corps helicopter, 25 sailers and Marines going down off the coast of Africa. All of them... See More
And we begin tonight with that developing story, word of a crash at sea and a stunning rescue. A Marine Corps helicopter, 25 sailers and Marines going down off the coast of Africa. All of them survived and ABC's chief global affairs correspondent Martha Raddatz leading us off tonight. Good evening. Reporter: Good evening, David. It's amazing that everyone got out alive in a crash like this involving one of these big top heavy helicopters that have a tendency to flip over and sink fast if they hit the water. It was a super stallion helicopter just like this one seen here approaching this same ship, the uss Mesa Verde. P landing these big helicopters is allenging. Today's accident happened on approach. An official says it hit the ship just before it was about to land and then crashed into the sea. This was a shock, bang, bang in the water. Reporter: The ship immediately launched a small boat to help rescue the 25 on board, all trained for exactly this kind of accident. They learn to overcome that initial fear and understand that self-control is what's going to be the key to survival. Reporter: Only one of those aboard sustained significant injury but not bad enough to require evacuation from the ship. These super stallions are one of many types of helicopters at sea, as we saw during a trip to the gulf of Oman. Vital to missions around the world, especially the volatile middle east. Martha is back with us live from Washington. Any early word on a cause here? Reporter: They're not sure what caused the crash, whether it was mechanical or a crew error. It certainly wasn't hostile action. Tonight everyone is just happy that everyone is safe, David. Including us, Martha Raddatz starting us off tonight. Thank you.
This transcript has been automatically generated and may not be 100% accurate.