Record-breaking discovery WWII bombs
During World War 2 the Germans built a ‘Scheinflugplatz’ in Rijsenhout (North Holland). The fake airport was built to divert attention from airfield Schiphol and was bombed several times between 1940 and 1942. Now, many years later, plans have been made to create a greenhouse complex. Construction on the complex won’t start until Heijmans has inspected the land.
126 suspicious objects
Inspection of the (80 ha) land will be conducted in two stages. First, 106 suspicious interferences will be dealt with, followed by another 20 in the second stage. This will be done up to four metres below ground level. Furthermore, a ‘depth detection’ will be executed between four and eight and a half metres below ground level. Adding up to a total of over 18.000 ‘stabs’.
After searching for one and a half week, specialists from the department ‘Opsporen Conventionele Explosieven (conventional explosives detection) found 19 bombs. The Heijmans experts skilfully assess and identify each bomb to determine the country of origin, calibre and type of detonation.
As soon as a bomb has been identified, the EOD Defensie (explosive ordnance disposal defence team) is informed. They are responsible for dismantling bombs and will, if necessary, detonate them. Clearance of the bombs is done upon agreement with the proper authorities and EODD. To this end, a clearance plan is made, which is executed later on. Heijmans assists in the dismantling and detonation of the bombs.
Special measuring system
Heijmans uses a special system to measure and further identify interferences during depth detec-tion. Special probes are used to carefully establish the size (volume) of an interference and to quickly determine whether it is an aerial bomb.
5 to 500 kg
Supposedly 230 British and 11 ‘sticks’ fire bombs were dropped on the site. The bombs that Heijmans found were, except for one British bomb, dropped by German combat aircrafts. The largest bomb weighs 500 kg and is almost the size of a grown-up man.