Of the 1,500+ who perished, only 300 were recovered. One of the bodies recovered was called the "Unknown Child," and wasn't identified until almost 100 years later.
A child's body was recovered from the water five days after the Titanic went down. Rescuers were so moved by the little boy that they buried him in a grave memorializing the 1,000 or so children that passed away.
The body was misidentified three times before he was finally identified as Sidney Goodwin when his shoes were donated to a museum and DNA tested.
Goodwin's tomb, marked with a headstone that says "unknown child," has remained untouched. His family stated "The tombstone of the unknown child represents all of the children who perished on the Titanic, and we left it that way."