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Memorial to Divers, Los Banos, California

San Luis Reservoir, just west of the San Joaquin Valley town of Los Banos, is one of California's key water facilities. Pumps in the Sacramento-San Joaquin Delta ship water down two massive canals -- the state-owned California Aqueduct and the federal Delta-Mendota Canal -- to a holding basin, or forebay, adjacent to the reservoir. From there, another set of pumps lifts water into the reservoir, where it's stored before being pumped again for delivery to farm and city customers farther south. All reservoirs are artificial creations, but there's an extra dimension of artificiality here: There's virtually no natural inflow to the reservoir; it exists only to receive the water pouring down two huge manufactured rivers.

The plaque above is at the Romero Visitors Center, just off Highway 152. There's something tragically artificial, and sterile, about the memorial to two divers killed at the pumping plant about 10 miles from the dam. But read the plaque first:

The plaque text:

"Dedicated in memory of Tim Crawford and Martin Alvarado, who lost their lives on Feb. 7,2007, while performing underwater inspections at the Dos Amigos Pumping Plant. They sacrificed their lives to keep the state's water supply safe and secure for the people of the state of California."

The wording is curious. These two men "sacrificed their lives to keep the state's water supply safe and secure."

It sounds heroic. But what actually happened?

I had no idea. But armed with the two names, it's easy to find out.

The two divers went into the water to inspect "trash racks" just upstream of the pumps at the Dos Amigos Pumping Plant, apparently looking for invasive mussels. Five of the six pumps at the facility were shut down, and one was running full bore. Somehow the divers wound up in front of the operating pump and were pinned against the trash rack -- a huge steel grate designed to prevent large debris from going through the pump. The untrained fellow Department of Water Resources employee who had been given the job of "tending" the dive lost sight of the divers' bubbles but had no idea what to do. By the time he thought to alert anyone in the pumping plant, the divers were probably out of air, if there were indeed still alive. It took more than an hour after trouble was detected to shut down the operating pump, and another 35 minutes after that before a recovery diver was in the water. Both divers were found at the bottom of the aqueduct, drowned.

Here's the Department of Water Resources report on the incident.

And here: a later investigative piece by San Francisco's ABC7 on the episode. Key quote:

Dive tender: How long these guys stay down? You know?

Control room: Uh-uh.

And finally: a DWR memorial publication to the two divers.

Submitted by @danbrekke.

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