It is hard to exactly place this moment in time, but the most likely is that it happened around 02 15. This moment is usually known as the beginning of the final plunge.
George Symons:
11501. Now just tell us about that?
- After I left the ship I gave the order to pull away. We were pulling very hard; we were pulling very steady; a moderate pull. After I gave that order we pulled away I should say about 200 yards, and I told them to lay on their oars, and just a little while after that, after I saw that the ship was doomed, I gave the order to pull a little further and so escape the suction.
11502. Now, just one moment. Just tell us why you say "after I saw the ship was doomed" you pulled away 200 yards? What was it that you saw that made you think that?
- Because her forecastle head was well under water then. Her lights had all disappeared then.
You could see her starboard sidelight, which was still burning, was not so very far from the water, and her stern was well up in the air.
11503. When you say all her lights went out, do you mean right away astern too?
- No, just her foremost lights had disappeared, and her starboard sidelight left burning was the only light, barring the masthead light, on that side of the bridge that I could see.
11504. Then you saw her with her stern out?
- Yes.
11505. Will you give us an idea what angle was her stern as far as you could see? How did it look to you; was it all up?
- More like that with a cant. (Describing.) I do not know what position you would call it altogether.
11506. Was it out of water?
- Yes.
11507. Did you see her keel?
-
No, you could not see her keel.
11508. (
The Commissioner.) Could you see the propellers?
-
You could just see the propellers.
11509. (
The Attorney-General.) You could see the propellers?
- Yes.
11510. Then when you saw her like that, what was the next thing that happened?
- Being the master of the situation, I used my own discretion. I said nothing to anybody about the ship being doomed, in my opinion. I pulled a little further away to escape, if there was any suction. A little while after that we pulled a little way and lay on the oars again. The other boats were around us by that time, and some were pulling further away from us. I stood and watched it till I heard two sharp explosions in the ship. What they were I could not say.
Then she suddenly took a top cant, her stern came well out of the water then.
(final plunge 02 15)
When Symons looked at the ship, he saw something like that. The Titanic on this pic is 8* by the head.