Big Brother Little Sister

The largest submarines of the world and both serves in the Russian navy:
The Typhoon and Borei class Nuclear Ballistic Missile Submarines
They are the Dmitri Donskoi Yuriy Dolgorukiy

Original drawing from the artist Ralph1989:
http://ralph1989.deviantart.com/art/Typhoon-and-Borei-341156887

Coloured by the Software: Recolored
https://recolored.en.softonic.com/?ex=CORE-117.5