On the topic of metro trains, the main station of Helsinki metro (the one under the Helsinki Railway station) was pretty much flooded last sunday afternoon due to a burst water main and a mysterious hole that had been drilled to the concrete casing around said water main by unknown persons at unknown time. No one seems to know where that hole came from, and when it appeared, but if the casing had been intact the water would likely have just burst to the street level surface rather than rushing down to the metro station's cavern.
The incident basically blocked the trains from going west through that spot and there's no track to circumwent the station, so the three westernmost metro stations are essentially out of order for the time being.
...and before you ask how much water it was; about 10000 m
3 of water, at worst spots piled up to 20 metres height in elevator shaft, so the pressure was quite massive, enough to deform the elevator shaft walls and doors:
Allegedly, several shops were pretty much aquariumized, as were the rest rooms of the ticket inspectors (three to four metres of water there...)
Here's a
news article in londonese, if you're interested.
Luckily, no casualties or even injuries. No one was in the elevator at the time of the leak, and the elevator shaft and doors didn't give in completely, so the people on platform level could get away without being washed away into the high voltage tracks on the actual metro tunnel...
