Now that it seems that the investigation is focussing by searching under water (sadly) I came across this website link and for people who posted/followed the thread of the search of Jos B (supect murder of Nicky Verstappen) it must ring a bell- Signi Search Dogs!
Signi search dogs is the most active when, in a certain area, a person is (possibly) drowned, whose location is unknown or when the place of drowning is doubted. The dogs search from the boat or from the waterfront for human scents, which suit a drowned person. After working out the smell, the dogs point out the location of the drowned victim, on the water surface, above the drowned person. In this way, the victim can be salvaged in a more targeted manner. For the dogs there are no restrictions regarding the depth of the water, the temperature of the water and the type of water (sea, river, canal, etc.). There are also hardly any restrictions regarding the time of drowning (hours / months / years).
Why search with dogs?
- By locating with dogs, the area in which a drowned person can be located is greatly reduced . Underwater equipment and divers can be used much more specifically.
- Because the dogs can search a large area in a relatively short time, Signi can find people who would otherwise be untraceable.
- Due to directions from the dogs, victims can become 'visible' under water, otherwise untraceable , due to depth, steep slopes or irregular soil.
- The use of the dogs increases the chances of a faster recovery of the victim and certainty for the relatives.
How can a dog locate a drowned person?
- From the water a mixture of peelers, fatty acids and gases (decomposition gases and anal gases) comes to the water surface.
- The gases are taken away by the wind, the dog smells the gases and reacts to them.
- The dog starts to bark and wag.
- The smell is "worked out" by dog and handler to the place where the "smell source" is the strongest.
- At the spot where the solids reach the surface of the water, the dog jumps into the water, swims to the location and starts swimming around the odor source.
The location on the water that the first dog has designated is
recorded using a GPS. Then, if a
second verification dog identifies the same place, a
buoy will be placed in the water at this location and the place will be further elaborated with
supporting means:
Sonar equipment
Signi search dogs are themselves in possession of an H
umminbird , a
side-scan sonar in combination with a 360-degree sonar, which can be used very diverse. Because the dogs greatly reduce the search area, interpreting the
sonar images can provide a quicker
answer . The sonar can also be used to target a diver or a drift to a location. The Humminbird is combined with a GPS
Underwater equipment
Signi search dogs has several underwater cameras. In this way, a body of a drowned person can
be visualized under water, or an object can be viewed. Signi search dogs also has a metal detector. This way, for example,
a car can be detected under the sand .
Treble equipment
Signi search dogs has their
own specialized treble , with which a drowned person can be dredged up. This is important if diving due to currents or low water temperatures is made more difficult.
Boats
Signi search dogs has
3 own boats , so Signi search dogs can be used on
any type of water .
Deep vision
Deep Vision makes its very advanced ROV (underwater camera) available if necessary.
GT
Vermissing te water | Stichting SIGNI zoekhonden
