Ignoramus posted a very plausible possibility.
Another is that you somehow got water into the air intake is sufficient volume to be drawn into a cylinder as fluid, the insbility of the water to compress caused the piston’s connecting rod (or wrist pin) to break freeing the piston and connecting rod parts to fall down the hole to the spinning crank like silverware into a garbage disposal, and the damage compounded.
Usually this takes driving through high water to happen, but your comment leaves the imagination to wander.