This is a very interesting thread !

I really love all underwarted related films !

Crimson Tide is a fantastic movie. I do not know how well the dts LD sounds however I do have an old Region 3 ( South East Asia ) DVD from 1999 methinks that has a non-anamorphic widescreen picture
and a fantastic dts audio track/mix. I am sure the dts LD sounds even better than the DVD I have ( half the bitrate ! ).

EDIT: Das Boot is probably the best sub themed motion picture. It is brilliant in every aspect ( story, acting, music ... ). It is just so brilliant on so many levels.

Waterworld as a scene that briefly goes under the water.
Waterworld (1995) [43118]

For Your Eyes Only has some underwater scenes.
For Your Eyes Only (1981) [ML101725]

Thunderball has some underwater scenes.
Thunderball (1965) [ML105655]

Never Say Never Again has some underwater scenes.
Never Say Never Again (1983) [14160]

The Spy Who Loved Me, naturally has some underwater scenes.
Spy Who Loved Me, The (1977) [ML102735]

The Poseidon Adventure
Poseidon Adventure, The (1972) [0416085]

Beyond the Poseidon Adventure
Beyond the Poseidon Adventure (1979) [NJL-11103]

Star Wars Episode 1 has a brief scene of underwater "the gungan city"
Star Wars: The Phantom Menace (1999) [PILF-2830]

Deep Raising
Deep Rising (1998) [13551 AS]

Jaws has few scenes underwater with "Bruce".
Jaws (1975) [41086]

Jaws 2 has some underwater scenes.
Jaws 2 (1978) [41367]

Jaws 3 has some underwater scenes.
Jaws 3 (1983) [40044]

VHD Jaws 3 letterbox 2.35:1 petty it didn't get a letterbox release for laserdisc.
Jaws 3D (1983) [V3D-101~2]

Jaws The Revenge has some shocking yet, underwater scenes.
Jaws 4: The Revenge (1987) [40723]

Would Fantastic Voyage count as "underwater themed" ?

Technically 55 % of the blood is plasma, and 92 % of that is water so ...........

Bit of a stretch I know lol .........

When i was a kid i knew they were going into a body but always thought of it more as a space movie

Maybe we could also make a list of post apocalyptic movies. I would find that very interesting.

This is a pretty complete book on that genre:

https://www.amazon.com/World-Gone-Wild- ... tic+movies

Although it breaks things down for vhs and dvd it doesn't cover what had LD releases. I went through the book and counted the ones I knew were in it that had LD releases and I counted close to 70 IIRC.

There was this thread from a ways back which was kind of a start on a list:

bifrostbear @ Category name and list

InnerSpace with some % of the body being made up of water.
Innerspace (1987) [11754]

Titanic
Titanic (1997) [LV334812-WS]

Raise the Titanic
Raise the Titanic (1980) [9023-80]

Flipper
Flipper (1996) [42983]

Free Willy
Free Willy (1993) [18000]

Free Willy 2
Free Willy 2 (1995) [18200]

Free Willy 3: The Rescue
Free Willy 3: The Rescue (1997) [14895]

Splash
Splash (1984) [7467 AS]

Piranha (1995)
Piranha (1995) [ID3587NH]

Piranha II flying killers (no sh*t)
Piranha II: Flying Killers (1981) [PILF-7283]

Dead Calm
Dead Calm (1989) [11870]

The Blue Lagoon
Blue Lagoon, The (1980) [VLD 2990]

Return to the Blue Lagoon
Return to the Blue Lagoon (1991) [50836]

Atomic Submarine
Atomic Submarine, The/First Man Into Space (1959) [ID3204GO]

The Beatles: Yellow Submarine "We all live in a yellow submarine"
The Beatles: Yellow Submarine (1968) [ML106160]

Underwater documentaies
http://www.lddb.com/search.php?search=u ... &format=ld

Does falling off the surf board count if you go into the water you go under the water as well with the Beach Boys.
The Beach Boys: An American Band (1985) [LD 15080]