This was a piece of concept art done back in 2007 for a 3D modeling class.
The concept was to take two vehicles and essentially combine them together in some way. I took the idea quite literally and ended up recreating "Skydiver" from the Gerry & Sylvia Anderson science fiction show "U.F.O.", combing a F-22 fighter jet and a Vanguard-class submarine.

This is the concept illistration for this version of Skydiver, the only thing I didn't draw or create was the SHADO emblem on the wings of the jet.

Photoshop 7.
Skydiver, SHADO and all "UFO" related are (c) Gerry Anderson Productions.
Art and vehicle design are mine.