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Many weapons, including aerial bombs in particular, are discovered during construction work, after lying undetected for decades. Having failed to explode while resting undiscovered is no guarantee that a bomb will not explode when disturbed. Such discoveries are common in heavily bombed cities, without a serious enough threat to warrant systematic searching.

Where there is known to be much unexploded ordnance, in cases of unexploded subsoil ordnance a remote investigation is done by visual interpretation of available historical aerial photographs. Modern techniques can combine geophysical and survey methods with modern electromagnetic and magnetic detectors. This provides digital mapping of UXO contamination with the aim to better target subsequent excavations, reducing the cost of digging on every metallic contact and speeding the clearance process. M

Many weapons, including aerial bombs in particular, are discovered during construction work, after lying undetected for decades. Having failed to explode while resting undiscovered is no guarantee that a bomb will not explode when disturbed. Such discoveries are common in heavily bombed cities, without a serious enough threat to warrant systematic searching.

Where there is known to be much unexploded ordnance, in cases of unexploded subsoil ordnance a remote investigation is done by visual interpretation of available historical aerial photographs. Modern techniques can combine geophysical and survey methods with modern electromagnetic and magnetic detectors. This provides digital mapping of UXO contamination with the aim to better target subsequent excavations, reducing the cost of digging on every metallic contact and speedin

Where there is known to be much unexploded ordnance, in cases of unexploded subsoil ordnance a remote investigation is done by visual interpretation of available historical aerial photographs. Modern techniques can combine geophysical and survey methods with modern electromagnetic and magnetic detectors. This provides digital mapping of UXO contamination with the aim to better target subsequent excavations, reducing the cost of digging on every metallic contact and speeding the clearance process. Magnetometer probes can detect UXO and provide geotechnical data before drilling or piling is carried out.[125]

In the U.S., the Strategic Environmental Research and Development Program (SERDP) and Environmental Security Technology Certification Program (ESTCP)[126] Department of Defense programs fund research into the detection and discrimination of UXO from scrap metal. Much of the cost of UXO removal comes from removing non-explosive items that the metal detectors have identified, so improved discrimination is critical. New techniques such as shape reconstruction from magnetic data and better de-noising techniques will reduce cleanup costs and enhance recovery.[127] The Interstate Technology & Regulatory Council published a Geophysical Classification for Munitions Response guidance document in August 2015.[128] UXO or UXBs (as they are called in some countries – unexploded bombs) are broadly classified into buried and unburied. The disposal team carries out reconnaissance of the area and determines the location of the ordnance. If is not buried it may be dug up carefully and disposed of. But if the bomb is buried it becomes a huge task. A team is formed to find the location of the bomb using metal detectors and then the earth is dug carefully.

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