Actually, they're not anonymous, we know their names and origins but, as usual, they have been left out of the spotlight ever since the disaster happened.
After the link below is the dramatised story of the engineers and stokers who helped save lives on the ship thanks to their effort and sacrifice. The film is a compelling drama featuring excellent actors and beautiful accents.
Coincidentally, it seems that you can watch many more movies for free on the same website, check FFILMS.ORG for yourselves.
For more heroes on board the liner, you can read this below about Titanic's musicians and their crucial role in keeping passengers calm and, subsequently, alive during the disaster:
Definitely, these unglorified heroes are my favourite heroes.