Many unanswered questions remain about the Navy’s Nov. 29 spill of environmentally hazardous aqueous film forming foam (AFFF) used to suppress fires at its Red Hill fuel-storage site — including just how long it will take to get answers. The Navy missed a Monday deadline to give the U.S. Environmental Protection Agency details about the AFFF cleanup, and on past spills at the underground fuel facility; instead, it has requested a five-week extension.

What caused the spill is also as-yet unverified. On that day, contractors worked on infrared sensors that activate the fire suppression system — but the Navy’s investigation report, required by its rules within 30 days, remains MIA.