Ahhh....I'm a software engineer. Figuring out possible causes from limited pieces of evidence is a necessary job skill. We call it "debugging".
I also used a problem-solving technique on the "baseball and bat" one: read it backwards. Not literally every word backwards, but read the conditions or constraints in reverse order. So given "How do you get out with a baseball and bat", then "three strikes" is the obvious wordplay, ignoring the "metallic dome" contrivance.
Plausible reasons:
1. The four men were divers, wearing dry suits.
2. The four men were dead, and sealed in waterproof coffins.
3. Ziploc storage bags! Keeps moisture out, and freshness in!
4. It's a dry lake bed.
Nope.
Yes! Not a SINGLE man drowned. They were all married.They were all married.
And happy to have drowned.
You guys are thinking about this way too hard.The boat has water-proof/sealed doors, so when the boat sank they went down with it, but stayed inside a water-tight part of the boat?
Ill try and find some more...
-I have feathers but no wings and when I hit you it will sting. What am i?