Still, the efforts have been recharged by National Guard specialists and urban search and rescue teams, as well as volunteers who have some knowledge of the terrain.
Authorities are asking others to stay away.
"We don't need any more people coming up here," Snohomish County Fire Chief Travis Hots said Tuesday. "The last thing that we want to have happen is people showing up in their cars and sneaking up on the pile and they are up there working independently on their own."
More than 100 people are missing in the wake of the massive landslide, which buried dozens of homes.
At least 14 people have been confirmed dead, and no survivors have been found since Saturday.
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