The Generation Gap - David Chiang (1973) - Junk Bay, New Territories

One of the gang's favourite hiding places is in amongst the wrecks awaiting deconstruction at Junk Bay/Tseung Kwan O. The large floating gantry structure was one of the so-called "screed and lay" barges that was used to lay a flat bed of stones on the seabed for the large segments of the original cross harbour tunnel to sit on.

I had a chat with Tymon who wrote that linked article (he is also responsible for the HKmaps.hk website that has been a huge help to me over the years) and he told me this was a very specialised job so the structures were basically custom built for a one-off use. This also explains why it couldn't be reused and was sold off for scrapping in Junk Bay.

The name on it is Severn River Trans-Harbour Construction Ltd. 

Following immense reclamation in the bay, that structure marks the location of what is now Pui Shing Garden next to the Ming Tak Estate in Hang Hau.

Anyway, it features prominently in the film as the location of Ling Xi's final battle against his fellow gang members as he finally realises he has spun out of control and no longer wants to be a criminal.