The expedition to Jaber Castle located in Brest Region, Belarus. January 2017
Jaber Castle was conquered by the Swedish during the Russian Swedish Nothern war in 1706 or The Twenty Year War (1700-1721). The castle was destroyed and arsenal drowned in the surrounding moats.
Today one can see the remains of the ramparts and moats – 15-20 meters wide and 2.5 meters deep. Moats have turned into swamps and are covered with trees and bushes. The goal of the expedition was to find the remains of the arsenal dumped in to the moat by the Swedish. According to the archives 48 cannons and other ammunition were dumped.
A high depth metal detector was used to locate bronze cannons and magnetometers MG200 and MG400 were used to locate the remaining arsenal (assuming it was iron).
Search was done through 30 centimeter ice. Several dozen anomalies were located and all of them magnetic i.e. made of iron. Two anomalies were uncovered and several objects were recovered from the depth of 2.5 meters. One of the anomalies looked like a piece of agricultural machinery, the other – several mortar cannonballs 30 centimeters in diameter and weighing 48 kilograms each.
We managed to lift to the surface two cannonballs and what looks like a boathook. The rest of the finds will be recovered during winter before the ice melts.
Cannonballs were identified by magnetometer as strong anomalies measuring tens of nanoteslas. It allowed to pinpoint location and approximate size of the sources. Considering the efficiency of magnetic prospecting on this site, more detailed prospecting is being planned in the future.