I recently moved to North Point and couldn't help notice that MTR exit B2 (the one leading to MacDonalds) has a massive metallic door (about ten inches thick!). That's totally odd, considering that other exits are protected with a simple metallic curtain, one of which is even installed behind the big door...
My first assumption was that there might have been a bank on the other side and this could have been a vault's door, but then I realised that the lock is apparently on the MTR side, not on the shop's side.
Does anyone know the story of that door? I have written to the MTR but they didn't answer.