Watch your mouth kid.

Pity you couldnt have been this active when you were part of the team.

Like all grainy poorly focused images it just looks like an artefact to me.  Like ghosts and other made up things derived from poorly taken photographs, it's probably nothing more than a bending of the light, a piece of dust on the lens, the reflection of the engine on the wing, or any other optical abnormality.  And besides, it'd be very hard to put a pod directly underneath the fuselage of a larger plane, because then the alighting gear has to extend all that much further to cover it.  I can't recall any large jet aircraft that has a massive fuel pod underneath.  All of them are on the wings.  This also doesn't even mention the fact that if you're building a giant flying fuel bomb that's due to hit, why try to modify some jet with an external tank when you can fill up the entire interior of it with fuel tanks instead?

And interestingly as well, grainy photograph manipulation is one of my specialties in photoshop   If you like I can add another fuel pod, the wings made out of fuel pods, or even a giant rubber ducky strapped to the underside if you want

Fear the Woodzilla