At some points, visibility is only one to two feet, which is likely true of the time when Naya Rivera went into the water as well.
There’s also vegetation and various other obstructions lurking under the water at the location where Rivera was lost as well as other conditions, including winds and chill that make the waters dangerous.
Visibility has been rough in the waters of Lake Piru as police from both Ventura County and Los Angeles County, a Coast Guard helicopter, cadaver dogs, sonar devices and more have all been on the scene and searching for Naya Rivera.