Data from gravimeters show that Death Valley 's bedrock floor tilts down toward the east .
Is deepest under Badwater Basin ; there is 9,000 feet ( 2,700 m ) of fill under Badwater .
Data from gravimeters show that Death Valley 's bedrock floor tilts down toward the east and is deepest under Badwater Basin ; there is 9,000 feet ( 2,700 m ) of fill under Badwater .