In my expert (
) opinion, it looks like whatever the boat struck was above the water, but below the level of the gunwale. I'd "speculate" a large, wide rock. Based on the bottom of the hull it doesn't seem that it hit much else--if anything--before it struck whatever damaged the bow, which seems a bit strange. What tends to happen is the boat goes over the obstruction, rather than into it. Notice the hull delaminated from the deck the entire way back.
The bow must have absorbed all of the energy from the moving boat--stopped--in those few feet.
edit: if you watch the video, it will show that the boat hit a rock wall on the shore, and the anchor chain had enough inertia to continue on shore and damage a house a few feet away.
All speculation, of course. Condolences to those involved.