seeingunderwater - illinois.gov

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20 / OutdoorIllinois November 2007 I t’s been a sad ritual for ages. Peo- ple searching for a drowning vic- tim years ago had very few options other than simply wait on the shore, or wander the water in boats, looking everywhere. In “Huckleberry Finn,” Mark Twain writes of how the firing of canons over water was believed to help locate the victim. It was all they knew how to do. When modern search and rescue equipment enabled people to dive into the deep waters and peer into the dark- ness, recovery efforts improved. But only slightly. Divers are still limited by water clarity—a swimmer in murky water can’t see, and some recovery efforts never succeed. Basic sonar is of only slight benefit in underwater search efforts, at best. But a new generation of sonar—originally designed for high-tech anglers—is prov- ing to be a stunning- ly accurate medium for locating any- thing underwater. “This is absolute- ly the greatest technological develop- ment I’ve seen in all of my years of law enforcement,” Conservation Police Sergeant Tony Rendleman announced recently. “It’s definitely the greatest tool we have today in search and recovery operations on the water.” What is it? It’s the Hummingbird 997c, a fish-finder capable of shooting sonar sideways underwater, thereby blanketing the lake or river bottom. The fine details transmitted to the operator’s viewing screen instantly reveal any object, from sub- merged vehicles to a missing gun. During a search operation on the Mississippi River in the summer of 2007, Rendleman had barely settled into his patrol boat to begin trolling when he spotted an object on his elec- tronic screen. Search crews working downriver for hours had failed to find anything until Rendleman arrived. “It’s as if you’ve drained the river or lake and can see everything,” he added. “It’s that clear.” In addition to speeding up recovery operations following a drowning, the new technology stands to foil the old criminal standby of ditching evidence into a lake. “If a guy tosses a shotgun in a lake, I’ll be able to find it,” Rendleman promised. Seeing Underwater When tragedy strikes in lakes and rivers, recov- ery might take days or weeks. New technology can locate lost objects in seconds. Story and Photos By Joe McFarland Conservation Police Sergeant Tony Rendleman uses the high-definition imaging of the Hummingbird 997c to quickly locate objects underwater.

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Page 1: SeeingUnderwater - Illinois.gov

20 / OutdoorIllinois November 2007

It’s been a sad ritual for ages. Peo-ple searching for a drowning vic-tim years ago had very fewoptions other than simply wait onthe shore, or wander the water inboats, looking everywhere. In“Huckleberry Finn,” Mark Twain

writes of how the firing of canons overwater was believed to help locate thevictim. It was all they knew how to do.

When modern search and rescueequipment enabled people to dive intothe deep waters and peer into the dark-ness, recovery efforts improved. Butonly slightly. Divers are still limited bywater clarity—a swimmer in murkywater can’t see, and some recoveryefforts never succeed.

Basic sonar is of only slight benefit inunderwater search efforts, at best. But anew generation of sonar—originallydesigned for high-tech anglers—is prov-

ing to be a stunning-ly accurate mediumfor locating any-thing underwater.

“This is absolute-ly the greatest technological develop-ment I’ve seen in all of my years of lawenforcement,” Conservation PoliceSergeant Tony Rendleman announcedrecently. “It’s definitely the greatest toolwe have today in search and recoveryoperations on the water.”

What is it? It’s the Hummingbird997c, a fish-finder capable of shootingsonar sideways underwater, therebyblanketing the lake or river bottom. Thefine details transmitted to the operator’sviewing screen instantly reveal any

object, from sub-merged vehicles toa missing gun.

During a searchoperation on the

Mississippi River in the summer of2007, Rendleman had barely settledinto his patrol boat to begin trollingwhen he spotted an object on his elec-tronic screen. Search crews workingdownriver for hours had failed to findanything until Rendleman arrived.

“It’s as if you’ve drained the river orlake and can see everything,” he added.“It’s that clear.”

In addition to speeding up recoveryoperations following a drowning, thenew technology stands to foil the oldcriminal standby of ditching evidenceinto a lake.

“If a guy tosses a shotgun in a lake,I’ll be able to find it,” Rendlemanpromised.

Seeing UnderwaterWhen tragedy strikesin lakes and rivers, recov-ery might take days orweeks. New technologycan locate lost objectsin seconds.

Story and Photos ByJoe McFarland

Conservation Police Sergeant Tony

Rendleman uses the high-definition

imaging of the Hummingbird 997c to

quickly locate objects underwater.