Sinking of the Wilhelm Gustloff (2002, The Sea Hunters, Documentary)

Real-life adventures into the depths of World War II. Join bestselling action-adventure author Clive Cussler, renowned maritime archaeologist James Delgado, and their crack team of divers to explore some of the most significant shipwrecks of World War II.

Long shrouded in Soviet secrecy, the remains of the German refugee ship Wilhelm Gustloff mark the largest maritime disaster in the history of the world, one that claimed more than 9,000 lives. Diving cold Baltic waters, the Sea Hunters become the first to explore the wreck and reveal their findings to the world.

Alex4History's supplementary notes:
From "The Sea Hunters: Relics of WWII" series.
For more info:
https://en.wikipedia.org/wiki/MV_Wilhelm_Gustloff