Before the refit to allow room for the Flying Sub the Seaview was figured to be 600 feet long and could run at 55 knots. After the refit, and looking at the specs of the Flying Sub comparing it's size to the Seaview, it changed the dimensions of Seaview drastically and now only looks like it is about 350-400 feet. To keep the Seaview at about 600 feet and the relationship in size of the Flying Sub to the Seaview the Flying Sub would have to be about twice as big as it is.
I prefer the pre Flying Sub dimensions myself.
As far as how deep it could go, it varied depending on which episode you watched although it seems that more episodes showed crush depth to be about 4500 feet. That is what the depth gauge showed, anyway.
Here are blueprints of Seaview as configured after refit of the Flying Sub.
This shows the Port Profile Cutaway and Deck A Overview.
Here are blueprints of Seaview as configured after refit of the Flying Sub.
This shows Decks B and C Overview.
See the drawings forSeaview as configured in 2002 by Mike Adamson for "Skyfall".
See the history of Nelson's Folly as seen by Mike Adamson for "Skyfall".
Here is a link to a virtual wind tunnel page. A wind tunnel was where the Flying Sub was tested. Experiment and learn how a wind tunnel works.
This opens up in a new window.
Various Systems Tested At AEDC Scroll down and click on the FS 1 to see info on it.
Propulsion Wind Tunnel (PWT)Where the Flying Sub and other systems were tested.
These drawings are used with permission of Fred Barr.