Entrance in Titanic Honor and Glory
The First Class Gangway doors we're used as entrance to 1st Class spaces, located at D-deck.
These doors would also be used to board lifeboats when they we're getting lowered. At around 1:00 AM, Lights asked "big neck" to open the doors with 6 seamen on portside. After that him and seamen wouldn't be seen again.
One of the gangway doors
Portside gangway door on the shipwreck