Losing Navy SEALs at sea during operations is extremely rare. It's only happened a handful of times.

• Two Navy SEALs went missing overboard during an operation in the Red Sea last week, per CENTCOM.
• Search-and-rescue operations are still ongoing, but time is running out.
• Losing Navy SEALs at sea during overseas operations is extremely rare, experts said.

Two US Navy SEALs are feared dead after going missing during a nighttime raid off the coast of Somalia more than a week ago.