Does anybody know How big the subs show building is ?
I don't know in terms of square footage, but basically... it extends back as far as Autopia does. If you ride the DRR, you can see the old sub drydock to the right of the Agrifuture billboard, and from the Monorail, you can sneak a peek of the "Oceanographic" sign above the drydock if you sit on the station side of the Monorail.
It would be cool if they would switch to fuel cells. After all the exhaust is water, and they would have no trouble with the safety and distribution problems of hydrogen. I don't believe a voilent crash between subs would be too much of a worry =)
If it's a fuel cell that doesn't use pure hydrogen (like an alcohol or hydrocarbon fuel cell), then it will have exhaust other than water. Seems like you can't have your cake and eat it too with fuel cells.