Bronze Key (Sinking Submarine)
The Bronze Key is a key found in the level Sinking Submarine in Tomb Raider Chronicles. One of Mikhailov's goons drops the key after Lara kills him.
The Bronze Key is used to unlock a door that leads to the second, and the level's last,secret - a Golden Rose that's in a drawer.
In the Russia section there's another Bronze Key to be found in addition to this one: in The Submarine Lara finds a key after knocking out the submarine's cook.