I thought it was rather poor myself - in the writing. There seemed to be a lot of confusion and mixing of terms - particularly "hydrophones" (passive) and "sonar" and "asdic" (wtf!) when characterising how the venturer managed to acquire the Uboat while both were underwater (and without alerting the U-boat). It never suggested for what purpose the Japs wanted 60 tons of mercury for - which would have been interesting, nor looked in any detail at the Norwegian proposals for sealing the wreck-site - which are very contentious on several grounds.
All in all, worth taping and watching, but could have been done a lot better. IMHO.
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