"Star Trek" is a registered trademark of CBS. "Star Trek V: The Final Frontier" and "Star Trek VI: The Undiscovered Country" © Paramount Pictures Corporation.
With a little help from Star Trek VI we were able to fill in the missing pieces and realize a very different Great Barrier sequence--one we had imagined and developed almost two years earlier.
Behind all the obvious new visuals is an absurd amount of reconstructive editing. If you were to line it up against the original 1989 sequence, you would find that the BTB version is considerably longer and quickly departs from the source in both video and audio. We get back on pace with the original film when the planet is revealed.
See also https://startrekbtb.wordpress.com