although quite nice info :
https://www.youtube.com/watch?v=sneyhtx3L5o
both the comments of the viewers and the explanation of the Englisg chap ( although he corrects himself very well by saying "my opninion") are a nice mix of realistic comments, knowledge and expertise but also utter nonsense and assumptions without any foundation.
Nevertheless a nice piece of film and some nice comments ( a few good ones from Bulgarians)
another nice film from the museum in Split Croatia:
https://www.youtube.com/watch?v=jc2N4qGskTE