“All three went down with the Titanic on April 15, 1912...”
The Titanic actually sank on April 14, 1912.
E_M
Here are two of the numerous links that have details of the timeline:
https://www.history.com/topics/early-20th-century-us/titanic
“Titanic, nearly perpendicular and with many of her lights still aglow, finally dove beneath the ocean’s surface at about 2:20 a.m. on April 15, 1912.”
https://education.nationalgeographic.org/resource/titanic-sinks/
“On April 15, 1912, the RMS Titanic sunk in the North Atlantic Ocean.”