LIVERMORE -- The search for a Mountain House man who disappeared beneath the surface of Livermore's Lake Del Valle while kayaking with his sister Sunday has been suspended while funding is secured for additional resources, authorities said.

From 8 a.m. to 10 p.m. Monday, dive crews scanned an area the size of a football field using sonar technology and were unable to locate the body of 30-year-old Michael Perez, East Bay Regional Park police Lt. Jon King said.

Additional resources including additional divers and higher resolution side-scan sonar will be required to continue the search, and King did not have an estimate on when the funding would be secured to scan the lake once more.

"We are in the process of working on the additional resources," King said. "The difficult part is we're not in a rescue mode right now, unfortunately. We're in a recovery mode."

Despite the fact that dive crews came up empty-handed after an exhaustive two-day search of the lake at 7000 Del Valle Road, authorities are not considering any other possibilities besides the man's body being submerged somewhere beneath the surface of Lake Del Valle.

"At this point in time we are not looking at any other angles or suspicions," said King, who noted that multiple factors may have caused the body to drift. Winds blowing across the water Sunday clocked in at 20 mph, and releases from Del Valle Dam may have produced a slight current.


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King also noted that the sole witness, Perez's sister, was under an incredible amount of stress as she tried to flag down help from boats across the lake from her kayak, and that she may have mistaken her brother's exact location when he lost his ability to swim.

Perez had decided he wanted to go for a swim about 2:30 p.m. and removed his life vest before plunging from his kayak into the water and swimming to the west shore of the lake, King said. The man made it to the shore and was on his way back to his kayak when he yelled to his sister to throw him his life vest from the kayak, mere yards from where he was swimming.

The woman scrambled to get the man his life preserver, and was trying to hand it to him without leaving the boat, King said. The man made a final lunge for the life jacket before he sunk beneath the surface.

King said he did not know whether the man suffered from any medical conditions that may have caused him to lose his ability to swim, and said that possibility is part of detectives' investigation. While King could not speak directly to ¿the man's proficiency as a swimmer, authorities on scene Monday noted the man swam with relative ease the 100 yards from the kayak to the west shore and was just yards from the boat when his panic arose.

Contact Erin Ivie at eivie@bayareanewsgroup.com. Follow her at Twitter.com/erin_ivie.