The Royal Netherlands Navy lost seven submarines in WOII. Six disappeared without a trace. Five have been found. Hr. Ms. O13 is the last submarine still to be found. The wreck lies on the bottom of the sea, somewhere in the North Sea. What exactly happened to O13 is a big mystery.
Experts are trying to determine the location of the wreck. Also in 2013, an expedition will be launched to actually find the wreck. Will the mystery of O13 finally be solved? Will we find the grave of the 34 men still on board? Will Hr. Ms. O13 finally come home and will she no longer be ‘Still On Patrol’?