On December 7th, 1941, Japanese naval forces launched a surprise attack against the United States, intent on destroying the country’s will to fight. During the attack, 21 ships of the U.S. Pacific Fleet were damaged or sunk.

For many, the story continues with the U.S. entry into World War II and the rest is history. But, there is another story that is less known and not captured in many history books. It's the story of the work that began immediately after the attack on Pearl Harbor, and resulted in eighteen of those 21 ships being raised, repaired and returned to service to help fight and win World War II.

WATCH: Damage and salvage at Pearl Harbor

WATCH: The Japanese view of America's will to fight