[T-zex]

And NS2 was not operational at all, therefore the accident hypothesis is less likely there.

[MichaelCollins]

It was pressurized but not flowing (which confounds the pig hypothesis I've seen some commenters put forward.)

[lesuorac]

I dunno, I always thought it made it more likely. Funding for NS2 has dried up so whose going to bother leaving their nice warm hut to go do required maintenance?