South Pacific seafarers firmly believed, for centuries, death by giant clam was part of everyday ocean life. The giant clam had a reputation for laying in wait for unsuspecting swimmers and scuba divers. Its giant mouth would open and swallow them whole. Wham, clam, thank you Ma’am. A whole scuba diver!? In one sitting!? Yeah, right.
I stuck my whole arm, well, up to my elbow, inside this chap and it did absolutely nothing. It used its adductor muscle to start closing its giant mouth and then opened it again. That’s adductor muscle; not abductor muscle. Just in case you were wondering.
So, there it is, first-hand and arm experience death by giant clam is just a southern Pacific yarn from yesteryear.