Elwha River rocks
Screen capture of a video collected March 8, 2013, on the west side of the Elwha River delta in the Strait of Juan de Fuca, Washington. Seafloor is about 30 meters (100 feet) deep. This area has strong currents and a lot of material (suspended sediment) in the water. Two red laser dots near the bottom of the video are 10 centimeters (nearly 4 inches) apart.