My guess at what if Doctor Who wasn't axed in 1989/Title sequences

Intro
We are underwater. A golden wisp guides us out of the water along with the TARDIS. A stone version of McCoy's face appears. W, H and O fly above the water. The wisp transforms into "Doctor". The episode title and writer appear under the logo.

Outro
Just the camera flying over the sea. After the credits, the logo bursts.