One word: OIL. They was going to get more oil and most importantly they would deprive Soviet Union from oil. And next to Caucasus is Middle East with even more oil!
British interests in Africa and India would be threatened as well.
Germans
Revenge
In WW2 the Germans got as far as Stalingrad in the south, and the Caucasus mountains, just north of Grozny. Leningrad was besieged in the north, & Moscow was not reached. Essentially Stalingrad was as far as the Germans got, at the end of 1942.
The Ural Mountains and the Caucasus Mountains are both separate mountain ranges.
Mercury used as ballast
To secure the resources in the Caucasus. Also to prevent the Soviet Union from being a military threat. Of course also the ideological aim of destroying Bolshevism.
The mountains that are between the black sea and the Caspian sea is the caucasus The Caucasus Mountains
Germans
Because they want to.
Because the Germans invaded them.
Viceroyalty of the Caucasus ended in 1917.
Viceroyalty of the Caucasus was created in 1801.
Caucasus Online was created in 1998.
Caucasus Institute was created in 2002.
Battle of the Caucasus happened in 1941.
Caucasus University was created in 2004.
They were mostly germans... and people who didn't want to get murdured by Hilter.