What is being disputed here is the cause of the accident. Now, the JAIC assumed an intact hull, so it had to hypothesize a scenario where a huge ingress of water managed to breach the superstructure. i.e., it put forward an explanation that windows on Deck 4 must have smashed and that is how. This is because even with >2,000 tonnes <6,000 tonnes of water filling the car deck, even the JAIC realised that would not be enough to make it sink, with out it turning upside down first. However, it does work if as is argued, there was a breach in the hull. We know now there is a massive 22m gap in the hull. The explanation now is that this breach in the hull happened more recently due to the vessel turning 12° onto a 'rocky outcrop' and not because it was already there causing it to sink the way it did.