Could the lost Navy SEALs still be alive? It's unlikely, but their world-class training gives them a shot.

• Two Navy SEALs have been missing since an operation off Somalia on Thursday. 
• A search and rescue operation is underway. Reports say the SEALs fell into the water.
• Their chances of survival are slim, but their elite training gives them a shot, analysts said.

Two US Navy SEALs who went missing off the coast of Somalia have little chance of survival after four days, military experts said.

But their world-class training in water survival give them better chances than most people.