My experience of tigers in the wild that have not been conditioned by feeding is that they are quite shy.
When you said that you went to 35m to have a closer look at a tiger, I thought it would be on a blue water dive. I would never in a million years have thought that would happen at a baited shark dive at Tiger Zoo. To me, dropping to 35m to have a closer look at a tiger during a baited shark dive would mean that you have ignored safety protocols.
I don't find it at all necessary to provide a defination of blue water diving, which I consider self explanatory.
From my perspective, the Elphinstone video is indicative of a videographer who chases subjects. You are welcome to a different interpretation.