Made this ahead of the 111th anniversary of her sinking,

At 2:19am, ship time, RMS Titanic began its final dive to the sea floor, with approximately 1500 souls on board.
This image is a loose recreation of the disaster with various ponies to help visualize both the scale of the ship, and just a small fraction of people/ponies left on board in the final seconds.
And yes, Cadance and Shining are referencing the 1997 film.

The ship went under at 2:20am, leaving 1500 people in the water, freezing or drowning in the freezing water.

Links to the assets I used in this image;
Various pony models;
Steam Workshop::Maud Pie (steamcommunity.com)
Steam Workshop::Nahka's Pony Overhaul: Females #2 (steamcommunity.com)
Steam Workshop::Nahka's Pony Overhaul: Females #1 (steamcommunity.com)
Steam Workshop::Nahka's Pony Overhaul: Mane6 (steamcommunity.com)
Steam Workshop::My Little Pony G5 Pack (steamcommunity.com)
Steam Workshop::MLP RoseLuck (steamcommunity.com)
Steam Workshop::Filly Pack Overhaul — Pony (steamcommunity.com)
Steam Workshop::Shining Armor & Princess Cadance (steamcommunity.com)
Steam Workshop::Doctor Hooves (steamcommunity.com)
Steam Workshop::[MLP] Fleur De lis (steamcommunity.com)
RMS Titanic's stern part of;
Steam Workshop::Sinking Titanic Adventure (steamcommunity.com)