Dive summary:
- Three boats were lowered into a deep tunnel to begin removing plastic trash, wood and other debris that has been collecting 300 feet beneath the surface since 1994 in a wastewater storage cavern.
- There is an estimated 800 cubic yards of trash collected at the end of the tunnel which is expected to take 40 days to clean up.
- The trash has been collecting over the years from overflowing sewers pushing waste down the pipe then being filtered out when the water is pumped back to the surface for treatment.
From the article:
Three boats were lowered into the bottom end of the deep tunnel Wednesday morning to begin removing plastic trash, wood and other floating debris that has collected since the wastewater storage cavern was put into service in 1994.
An estimated 800 cubic yards of urban flotsam and jetsam is bobbing in shallow water in the final mile of the tunnel 300 feet beneath the surface, Milwaukee Metropolitan Sewerage District officials said. ...
