[C210N]

reporters saw one tunnel being used to bring in cement and gravel suddenly fill with water

The only improvement I can see here would be that these tunnels were used to bring in water, and that the Egyptians were flooding them all with cement and gravel.

[hinckley buzzard]

I think flooding the tunnels with incendiary tear gas would be even more effective. Heck, it worked for BillyBoy and Janet Reno at Waco.