There was footage taken and as far as I know, it's only available (Legally) on the specials which National Geographic produced or licensed the footage to.
I respectfully disagree. The mast light was gently pulled from the foremast, not yanked off so I don't see how this could affect the rest of the mast. The mast collapsed sometime between 2001 and 2004, which is considerably after 1987.
(and Ballard's own 1985 wreck pictures show that no bell or phone was still inside it).
Removal of the mast light was not responsible for what happened to the crow's nest, and I find it amazing no one can just admit that we were fortunate we could still see it in 85 when it likely only had two years left by then. If we'd found the wreck thirty years earlier, there undoubtedly would have been more things still visible that were gone by 1985!
The 1985 pictures were from Argo - there's no way you'd have been able to see what was inside the crow's nest.
(while in the meantime, the likes of George Tulloch just went about their tasks in total anonymity and adding more to our knowledge of the ship than Ballard did in an eighteen year span)