The frantic search — in a race against time — to find a missing comrade.

Within minutes of starting the training dive off Broderick Park in the Niagara River, it was clear something was very wrong.

And now, we've received the report from the state's Public Employee Safety and Health Bureau detailing what happened last October when Buffalo Police Lieutenant Craig Lehner slipped beneath the surface.

But it all starts long before that fateful Friday the 13^th.

Lehner, 34, had joined the Buffalo Police Underwater Rescue and Recovery Team six months prior, in April. He received all new dive equipment at the time.

He completed five training dives with the unit: at the foot of Michigan Street in a slip south of Wilkeson Pointe Park and in the Union Ship Canal.

Both of those locations are enclosed on three sides, behind break walls, and according to the report, have minimal currents.

The report states this was Lehner's sixth dive with the team and his first in swift water.

PESH states Lehner had not yet been provided any rescue or self-rescue training. In fact, it states not all dive team members had experience or training in emergency procedures. It shows out of their average of 12 total training dives per year, the dive team completed one to two rescue or self-rescue dives.

On October 13, 2017, Officer Lehner went into the water at Broderick Park at 12:45 p.m.

Three minutes later, his tether went slack, indicating that something was wrong.

Three rescue divers went in to try to save him. They were all tethered, but the current was too strong and they ended up having to cut their lines and surface.

The PESH report shows when his body was recovered five days later, the tether was still attached to Lehner's safety harness. There were three cut marks on the tether and his titanium EMT shears were missing from his harness. The report says this was likely the result of Lehner's attempt to free himself.

The report notes when Lehner's body was found, his tank was more than half full of air, the air valve was in the fully on position, and the latch on the tether was still in place and in working order.

The report notes one minor and four serious violations by the Buffalo Police Department in regard to its diving procedures, which the BPD says it is already working to address.

The family's lawsuit against the department and city is still pending.