The whole Glitchworld thing's been debunked many times by several prominent dataminers. It's a cool concept for sure, but it just doesn't exist in the SMW code as far as any credible analysis shows. G4 might've had a show discussing in-game secrets and this myth fits right in, but it …

Dude, that's awesome! Might be some interestin' code to peek at too. Can you imagine what kind of workaround hacks your cousin had to use to make a homemade game back in '92? I'm strangely hyped to dive into that. Get it? Because submarine... never mind. Still, if you open-source …

There's a possibility that the invincibility glitch is tied to an event that didn’t trigger correctly. Sometimes, game events can conflict with each other if tasks are completed out of order or too quickly. Have you tried replaying the mission from a previous save and changing your approach?