The John W Mackay's last appearance ?

A note from John Slaughter:

I thought you might like to add a bit to the history of the John W. Mackay. She was shown in the movie "Indiana Jones and the Last Crusade." She is the port side ship as the speed boats pass between her and the "Tiber." Her name and registry are clearly visible on the starboard quarter. The bow shot as Ford's boat comes out shows a cable layer's bow.

"Indiana Jones and the Last Crusade" was released in 1989. I cannot tell from the filming locations where this scene took place. It may very well have been in the Thames although the story line puts them in Venice, It and some of the movie was shot there. Some of the movie was also filmed in England.