Originally Posted by
golfer20
Thanks - I saw some references to an underground tunnel between T2 and T3, but I couldn't tell if it was pre-security or post-security.
It's a bus link I'm afraid, unless you go landside. There isn't a public tunnel, and if it existed it would need to be over 700 metres long - and probably somewhat more than that - so that's impractical really. That is the length of the T5A to T5C tunnel, but only FTers and staff use it.