Occasionally there had been a muffled thud or deadened explosion within the ship. Now, without warning she seemed to start forward, moving forward and into the water at an angle of about fifteen degrees. This movement with the water rushing up toward us was accompanied by a rumbling roar, mixed with more muffled explosions. It was like standing under a steel railway bridge while an express train passes overhead mingled with the noise of a pressed steel factory and wholesale breakage of china.