China said Thursday it is coordinating with the U.S. Navy in the search for a missing U.S. sailor in the South China Sea, a rare show of goodwill between the navies in the disputed waters.

The U.S. 7th Fleet said Tuesday that U.S. and Japanese ships were looking for an unnamed sailor from the USS Stethem destroyer who went missing during a routine operation in an unspecified section of the South China Sea.

It said multiple searches were conducted inside the ship, but to no avail.