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Danger Keep Out

L-shaped depression

Red sticks

Pat and Stephen examining site

47mm cartridge case

Into the jungle

Ready to 'mow the lawn'

Pat smiling watching the drone

Drone overhead

Penny size

Potential UXO

Palauan UXO tech

UXO tools

Pat points out strafed building

Pat with navigation tools

Jungle

Pat ponders

NGATPANG STATE, Palau -- In 1944, faced with severed supply lines, a detachment of Japanese secret police holed up in the jungle here are thought to have decided that the easiest way to deal with a group of as many as two dozen hungry POWs, missionaries, priests, and guest workers was to execute them.

Since then, the grave site where the victims were buried has remained unfound. But for more than 14 years a volunteer organization called the BentProp Project has been hunting the Palauan jungle here for the grave site. BentProp also has been working for years in Palau to locate American military aircraft lost during World War II battles with the Japanese, as well as the remains of the airmen who flew them.

Even as BentProp searched for the grave site in the jungle it has nicknamed "Police Hill," another organization has been working in the same area to help rid Palau of thousands of pieces of unexploded ordnance from World Wars I and II. Known as Cleared Ground Demining, the group has removed 30,000 pieces of "UXO," more than one piece for every one of the South Pacific island nation's 21,000 citizens.

On April 1, BentProp members and a reporter from CNET stopped to survey the area, pausing by this sign, placed by Cleared Ground, designating a field thought to contain dangerous UXO.

Caption by / Photo by Daniel Terdiman/CNET

According to testimony given by Japanese prisoners at post-World War II war tribunals, the secret police may have executed the POWs and others and then pushed them into L-shaped pits. BentProp has been looking for the grave site for 14 years, and this year, thanks to new information, has spotted a number of sites that, like this one, according to team leader Pat Scannon, have looked promising.

Caption by / Photo by Daniel Terdiman/CNET

After BentProp's initial surveys of the sites, Cleared Ground worked for a day to see if the area contained any UXO or detectable metal that could be signs of zippers, buttons, or other human artifacts. Though it's unknown what is here, this site is full of red sticks placed by Cleared Ground, each of which represents a piece of metal at least the size of a penny and at least a foot beneath the surface.

Caption by / Photo by Daniel Terdiman/CNET

BentProp team leader Pat Scannon (left) and Cleared Ground co-founder Stephen Ballinger examine one of the sites that was thought to be a potential grave, and which Cleared Ground technicians had surveyed for metal remnants.

Caption by / Photo by Daniel Terdiman/CNET

A 47mm cartridge case uncovered by the Cleared Ground team just prior to the arrival of the BentProp team on April 2. Though potentially volatile, it was not considered "high explosive."

Caption by / Photo by Daniel Terdiman/CNET

The BentProp team walks into the Police Hill jungle in search of the grave site where POWs, missionaries, priests, and others may have been buried after being executed by Japanese secret police in 1944.

Caption by / Photo by Daniel Terdiman/CNET

Scripps Institution of Oceanography development engineer Evan Walsh launches a drone atop Police Hill. He sent the vehicle out to "mow the lawn," or fly low over the jungle canopy, hoping to capture infrared imagery that could reveal metal remnants, as well as to generate a detailed topographic map of the area.

Caption by / Photo by Daniel Terdiman/CNET

BentProp team leader Pat Scannon watches the drone flying over the jungle. "This is so cool," he said. "I didn't even have the smarts to think this was possible."

Caption by / Photo by Daniel Terdiman/CNET

Scannon and Walsh crane their necks to watch the drone pass directly overhead.

Caption by / Photo by Daniel Terdiman/CNET

Cleared Ground's Stephen Ballinger explains to Scannon that his group had surveyed the potential grave sites for any metal remnants bigger than a penny.

Caption by / Photo by Daniel Terdiman/CNET

A piece of potential unexploded ordnance in the Police Hill jungle.

Caption by / Photo by Daniel Terdiman/CNET

One of Cleared Ground's biggest achievements is training locals wherever it works to be unexploded-ordnance technicians. In Palau, the NGO has trained 10 locals at the highest levels, and five can work at underwater sites.

Caption by / Photo by Daniel Terdiman/CNET

Clearing unexploded ordnance is slow, methodical work. These are the tools the technicians use to slowly scrape away soil where the explosives may lie.

Caption by / Photo by Daniel Terdiman/CNET

Scannon points out a structure that was used by the Japanese secret police, which bears marks from being strafed by American planes.

Caption by / Photo by Daniel Terdiman/CNET

Scannon poses for a picture with a variety of different navigation tools, including a compass, and an iPad loaded with special software that the BentProp team uses to keep track of the many locations it has marked in the jungle over 14 years of work there.

Caption by / Photo by Daniel Terdiman/CNET

The Police Hill jungle, rich and lush with mangrove trees and other flora.

Caption by / Photo by Daniel Terdiman/CNET

Scannon ponders a thought as the BentProp team pauses in the Police Hill jungle.

Caption by / Photo by Daniel Terdiman/CNET
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