Here is the deep story context regarding that version and the technical fix to make it run. Many players seek out V71288 not just for nostalgia, but because the lore was significantly different—and arguably darker—than the final release. Avvai Shanmugi Tamilyogi Full - Ravikumar And Lead
If you have managed to download the files but the game won't launch, here is the fix: Aggressive Retsuko S2 - 05 Vostfr Better
Use the compatibility fixes above to experience this lost chapter of Subnautica's history.
There isn't an official "Deep Story" game mode; rather, players often search for this specific version to experience the that the developers scrapped later in development. The "fix" you are looking for usually relates to getting this old 32-bit build to run on modern 64-bit Windows systems.