Detectives had gotten a tip on a high-profile murder case. The investigation had gone cold until they got word that evidence may have been thrown in the La Brea tar pits. "It was like being asked to scuba dive in a pit of toxic cold molasses"
Sgt. David Mascarenas is the Dive Supervisor for the Los Angeles Police Department. He's been diving his whole life, and prides himself on never refusing a dive, no matter how treacherous. At least until the summer of 2013, when a murder investigation led him into the unusually murky waters of the La Brea tar pits.