The Jensen Code - The Complete Series

All 13 episodes of the 1970s children's mystery series that follows unusual events at an outdoor activity centre. When Terry Connor (David Bradley), a 16-year-old visitor to the centre, sets off with instructor Alex (Tony Wright) to go potholing, he is unprepared for the disturbing day he will face. When, deep underground, Terry drops his torch, Alex heads off to look for it and is gone for hours.

Terry begins to realise that something very strange lurks within the caves, but will he be brave enough to get to the bottom of the mystery?