Three questions from the film prologue.. (just saw it for the fourth time).
1. Scotty: The salt water will ruin the.. WHAT? What was he going to say? Also starships fly through nebulas and near suns, surely this is fretting and not science to say salt water will ruin anything.
2. Getting too close to the volcano heat will damage the ship. Again, suns! WTH?
3. How did they get the Enterprise under water without the natives seeing them? It's not like they were far out in the middle of the ocean, even with all the lights out (?!) the ship would be visible descending at night.