submarines can be made watertight.

Don't they have tanker trucks there for water? Or whatever...lots of fire trucks standing by in a picture but I don't see tanker trucks. Do they go to the sea and fill from there? WHich is OK..

What about provisions for gas..probably not great in an explosion.

Are there signs of concrete trucks being brought in? Loads of sand? When do they plan to start stockpiling? Or have they? mg