The sword, recovered off the coast of Israel, most likely belonged to a knight who fell into the sea or lost the weapon in battle, experts said. Shlomi Katzin attached a GoPro camera to his forehead, slipped on his diving fins and jumped into the waters off the Carmel coast of Israel, eager to go exploring. On the sandy floor of the Mediterranean Sea, he found a sword. Archaeologists would later determine that it was about 900 years old. It weighed four pounds, measured about four feet long and originated from the Third Crusade, experts said. “Oh yes, he was...