I returned to a favorite Titanic book recently - Titanic at Two, by Paul Quinn. One thing he went into was the idea that the Titanic started to sink rapidly because Boiler Room 4 suddenly gave way and filled with water, and that the forward hatch on the bow caved in causing a large amount of water to enter the bow. He suggests that they both occured at the same time like a domino effect. I'm just wondering - is this commonly accepted among Titanic experts to be the reason why the ship took that lurch forward, creating the wave? How could anyone know when the hatch caved in, and even if it did, there could've been flooding up to the hatch already. Do people think the cargo shaft at the bow was devoid of water during the sinking? And boiler room 4, how would anyone know what happened and still be able to get to the top and survive? Who was the last person to leave boiler room 4?