Sandhogs in front of tunnel boring machine (TBM) cutter head after it completed tunneling for the Staten Island Siphon to Brooklyn, March 26, 2015. The new 72-inch siphon was excavated at a depth of 100 feet and replaced the old original Narrows Siphons 1 and 2. It serves as the backup water feed for Staten Island. Photo by DEP Photographer Kristen Artz.