It's hard searching bay, diver testifies
                                                
Prosecutors try to show why body wasn't found
                                              
Wednesday, September 8, 2004
                                                        Diana Walsh and Stacy Finz,  Modesto Bee & others


Thick mud, strong currents, dark waters and a strong surge made it nearly impossible to locate Laci
Peterson's body or anchors on the floor of San Francisco Bay, an expert diver testified Tuesday.


Geoffrey Baehr, a member of the San Mateo County Sheriff’s Department Marine
and Cliff Rescue Unit who helped search the bay in the months after Peterson’s
disappearance, talked about waves and wind and his team’s inability to find her.


Searching the bay water was so difficult that even when divers had a known target,
they had trouble retrieving it, said  Baehr, who helped lead the search effort
off the Berkeley Marina and is the head diver for the Rescue Unit


He described his unit as composed of 25 members, primarily commercial or highly
experienced divers who respond to requests for searches, perform marine patrol,
homeland security patrol off bridges.  They also perform cliff rescues
off of the Pacific Coast, including diving in the San Francisco Bay.


Prosecutors in Scott Peterson's double-murder trial are trying to show why the body of the
eight-months-pregnant Laci Peterson went undetected in the bay despite months of
searching.

As an experienced diver who has been diving since 1968, he has had approximately
3,000 dives and 5,000 hours under water.  He was also an instructor for the National
Association of Underwater Instructors and the French Worldwide Diving Federation.
As both a sport and commercial diver, he has performed diving in all areas of the world.


His primary dives now are in zero visibility conditions, or "black water".

Baehr said he had participated in more than 15 diving expeditions between late December 2002, 
when Laci  was reported missing, and May 2003, a month after the body of the 27-year-old
missing Modesto woman
was discovered on the Richmond shoreline,using a sonar device

During one dive, Baehr said the crew accidentally dropped the underwater device used to detect items
to the bay floor after hitting an uncharted sandbar. Even though the crew members knew exactly
where the device landed, it took Baehr fourteen dives on four seperate occasions to retrieve it.


Baehr also described to the jury that often, because of tidal conditions,
some items may sink under the mud in the bottom of the Bay, or be covered by it.


"So if something is down in the mud, covered with mud, would it make
it difficult (to locate)?" Deputy District Attorney Rick Distaso asked.


"It makes it virtually impossible,'' Baehr responded. "And the wind and wave
action makes holding the search pattern difficult.  The wind in this area of
the Bay after  2:00 P.M. routinely creates waves which causes scalloped
(sonar) images. 
When this happens, the search is over for that day."

The purpose of Baehr's testimony is to counter defense attorney Mark Geragos' contention that
the sonar equipment used in the search is so accurate and powerful that it can find something
as small as a tin can. The defense maintains that the reason searchers didn't find Laci  is
because she wasn't there. He says someone other than Peterson killed the substitute
teacher and then planted her body in the bay long after she disappeared to frame his client.


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