According to the blog I got the photo from; the guy ended up on high spot and the waves came over the sides before he could get the boat off. You can see the motor is running and kicking up mud. Water Logged
I speared a wave on Amistad once and had that much water in the boat. Bags of plastics floating around my knees, I turned on the bilge and kept going, but I was in 50 feet of water also. If the motor had quit I might have been worried.