America is about to pay final respects to two of its fallen heroes more than a century after they lost their lives. But we can't tell you who they were and we may never know.

It is a solemn fact that the remains of Americans killed in conflicts dating back to World War II keep coming home from distant battlefields.

But Thursday was different, as flag draped caskets held unidentified sailors from the Civil War.

"Two human beings buried under there for 140 years or so," explained Joe Hoyt. He was one of the divers who discovered the remains in 240 feet of water off Cape Hatteras, North Carolina, where they had gone down with one of the Navy's most famous ships -- the USS Monitor.