[knarf]

Tank guys respond ...

Was the tank unmanned and the breech open ?

How could a grenade get all the way down and into the tank ?

[Abakumov]

Well, exactly. It doesn’t make sense. If it was abandoned, why not take it? If it was manned, wtf? Did first grenade somehow blow open breech? Or did they do it manually? Many questions that Allah Akbar does not answer.

[Tugo]

Suspect first explosion enabled the second to impode the cabin. Big headache.

[hinckley buzzard]

It looks to me like the first grenade exploded in the barrel with the breach block closed. The explosion may have forced it open, or the crew inside may have opened it to find out what the heck just happened. The second grenade let them know.