Black triangle craft over London Underground tunnel - am I mad?

This happened about six months ago and I'm still not sure whether to tell anyone properly. I work maintenance on the Central Line, and one evening around 2am (early shift handover), I was doing a routine inspection of the tunnel between St Paul's and Bank stations.

Now before anyone says it - I wasn't tired, I wasn't on anything, and I'm not prone to flights of fancy. But I saw what I can only describe as a triangular metallic object suspended about fifteen feet above the track bed, just floating there. No sound, no vibration through the rails, nothing. It was maybe twelve feet on each side, completely black, with what looked like small lights underneath.

I froze for probably twenty seconds, then it just... ascended straight up and disappeared into the tunnel ceiling (solid concrete and earth, mind you). When I checked the CCTV footage after, the cameras had all glitched during that exact five-minute window. Every single one.

My boss told me not to file a report because it would make the department look bad. I haven't told my wife. Am I genuinely mad, or has anyone else had experience with this sort of thing?

The CCTV glitch is suspicious, I'll give you that. But I'd want to ask: did you check the maintenance logs to see if that's normal? Systems do go down, and the Underground is ancient infrastructure. Could be coincidence.

That said, the descriptions of black triangles are consistent across dozens of reports globally. That's either a real phenomenon or the best-documented mass hallucination in history. I'm genuinely undecided which is weirder.

Your boss telling you to keep quiet is actually more interesting than the sighting itself. That's textbook institutional cover-up. The question is whether they're protecting national security or just protecting TfL's reputation. Either way, you should document everything - times, dates, names of witnesses if you can - while memories are fresh.

solid concrete and earth, mind you

Mate, if it went through solid concrete and earth, you're either describing something genuinely extraordinary or your mind filled in gaps. I'm not being rude, but that's kind of the point where we need physical evidence. Did you take photos? Measure anything? Get readings on your mobile?

This is fascinating because the London Underground has LOADS of weird folklore - phantom trains, Bedlam level stuff. And it's all dismissed because it happened below ground where fewer people see it. Classic institutional denial.

I'd suggest contacting BUFORA (British UFO Research Association) directly. They have researchers who specifically investigate workplace incidents. They're discreet and professional.

Right, so the issue with this account is that it requires multiple extraordinary claims: unknown craft, technology that can pass through solid matter, AND coordinated system failures. Occam's Razor suggests at least one of these has a mundane explanation.

That doesn't mean nothing happened. But which element are you most confident about? The sighting or the technical glitch?