Factory Entertainment 1/1 Aquaman Manta Knife Limited Edition Prop Replica" I never told you the story behind it. This was your grandfather's. He was one of the Navy's first frogmen during World War II. He was so stealthy in the water, his unit nicknamed him Manta. But after the war, his country forgot about him, so he went back to the sea, scavenging and surviving with his wit and this knife. He gave it to me when I was your age. And now it's yours, son." Passed down from father to son, this family heirloom is no ordinary