The state police recently floated tenders for purchasing 50 PBLGs and two RoVs with water jet disruptors and weapon mounts for their use in security situation.
The body of one of the nine workers trapped inside a coal mine in Assam's Dima Hasao district was recovered by army divers on Wednesday on the third day of the rescue operations, officials said.
The body of another worker, who was trapped inside a coal mine in Assam's Dima Hasao district, was recovered on Saturday from the quarry during rescue operations, an official said.
On skeletons being seen by the Navy team, the sources said the water inside the mines has high Sulphur content which can decompose the bodies very fast.
The body of the trapped miner was spotted on January 16 and efforts were on to pull it out of the shaft of the coal mine filled with water.
The officials said the body was spotted at a depth of more than 200 feet inside the "rat-hole" mine and naval divers brought it to its mouth.
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It said the authorities were making all efforts to save the lives of these persons and the Indian Navy and planes and helicopters of the Indian Air Force have been deployed in the rescue operation.
"The fourth body was found at 230ft in general area where the third body was found. It is located about 20 feet away from the pulley cart used to transport the dug-out coal," operation spokesperson R Susngi said.
The wreckage of the aircraft that disappeared over the English Channel last month carrying Premier League soccer player Emiliano Sala and his pilot has been located, the marine scientist directing the search said on Sunday.
However, the National Disaster Response Force, which has been engaged in the rescue operation since the day of the tragedy on December 13 last, will continue with their services.
The body, located 200 feet away from the bottom of the mine, was brought out using the Indian Navy's underwater remotely operated vehicle and an National Disaster Response Force boat on Wednesday, said operations spokesman R Susngi.
The search and rescue operation for the missing AN-32 aircraft entered its fifth day on Tuesday even as hopes of finding alive the 29 defence personnel on board receded as all leads till now have turned out to be bad.
Doomed AirAsia jet's fuselage was found on Wednesday raising hopes of retrieving the remaining bodies of the 162 people killed in the tragedy, as investigators downloaded the contents of black box recorders and were likely to crack the crash's mystery soon.
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