Not saying this is the meaning of Q's "Watch the water" post, but the post made me remember hearing about this story a while ago. Group consisted of foreigners from Pakistan, Saudi Arabia, and Singapore.
creepingsharia.wordpress.com/2013/05/16/saudis-pakistanis-caught-trespassing-at-reservoir-supplying-boston-drinking-water/
www.bostonmagazine.com/news/2013/05/15/trespassing-quabbin-reservoir-fbi/