When looking at the pictures again, the first few up until the boat gets to the bridge - the overhead gantry on the bridge has the extra bit on top - on the right hand side.
When you look at the pictures **once the boat has sunk* the extra bit on top is on the left hand side.
I wonder if the photographer went to the other side of the bridge to do the second half of the pictures - thus giving the impression that the boat actually sunk?
I could be way off beam but it looks possible to me