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marianne? reporter: investigators are convinced that whoever may have abducted sierra lamar knew this area very well which is why they have now expanded their search to local waterways. the search for missing morgan hill teenager sierra lamar expanded to the water today as members of the santa clara county underwater search and rescue unit used a zodiac and kayak to check ponds near sierra s home. given the dense brush, often a kayak search was the only option. by boat we re able to see things either in the water or close to the water that are visually unable to be seen by the people on the ground. reporter: divers will only get in the water if they find significant evidence. sheriff lori smith says the investigation is focused on the morgan hill area. we believe that the person is familiar with the area, is known in the area. we believe this was not a planned crime. it was a situational crime. it was instinctive. it was fast. reporter: deputies also used dogs ....