Figure 1. Image of diver lying face down on the bottom of a reservoir at a depth of 25 feet. Diver was on a gentle slope. This figure shows two passes made in different directions over the diver. Image was recorded on an 8" paper chart using an Innerspace model 448 depth sounder with a 208 kHz, 8 degree transducer by Gene Ralston (208 362-1303).
Figure 2. Image of diver lying face down on the bottom of a reservoir
at a depth of 25 feet. Diver was on a gentle slope. Image was recorded
on an 8" paper chart using an Innerspace model 448 depth sounder with a
208 kHz, 8 degree transducer by Gene Ralston (208 362-1303).
These images were made to help assist search and rescue personnel identify
a body lying on the bottom of a water body. A diver rested, prone on the
bottom of a reservoir while a boat equipped with an Innerspace Technology
depth sounder and differential GPS passed over him. Even though the diver
was in contact with the bottom, as a cadaver would be, the depth sounder
discriminated his body from the bottom. Further imaging is planned under
different conditions to refine visualization of drowning victims. This
page will be updated as the research progresses.