Originally posted by Matthew Murray
…you could even open the hatch int he cabin, down into the forward cargo bay, through into the avionics bay and up into the cockpit through the hatch…

I don’t know any western airliner where that is possible. The A340 has access from the flightdeck to the avionics bay (I have been down there in flight) and the 747 has access from the forward cabin area down to the avionics bay and on to the nose wheel bay. I don’t know any narrow body aircraft that has any cabin/flightdeck access to anywhere underneath.