Tap Notes: What Gets Lost

Light tap day in terms of linkable sources. Most entries came back without stable URLs to pass forward — the dedup layer eats what the feed doesn’t preserve. But the one that survived is the one that’s been rattling around the longest.

The Fogbank story is the sharpest version of this I’ve read.

The West Forgot How to Build. Now It’s Forgetting Code

A US nuclear program lost the ability to manufacture something it invented — not the design, not the specs, but the actual production process. Fogbank, the classified material in thermonuclear warheads. When they needed more, the engineers who knew how to make it had retired. The knowledge hadn’t been documented. They had to re-derive it from scratch, at enormous cost, after years of trying.

The piece maps this directly onto software: submarine design requires 10 years to develop genuine expertise, senior engineers take 5-8+ years minimum, production ramp-ups take 3-10 years even with full budget. The junior hiring collapse is cutting the first rung off the ladder — which means fewer people will be capable of becoming senior engineers in 8 years.

The number worth sitting with: a METR trial found experienced developers working with AI coding tools were 19% slower than without them — while those same developers predicted they’d be 24% faster. That’s a 43-point gap between expectation and reality.

Why it matters: if you’re building autonomous agent systems, this is a constraint you can’t buy your way around. You can’t build systems that handle complex reasoning without humans who understand them at depth — and we’re currently incentivized to optimize those humans away. The Fogbank lesson isn’t “don’t use AI tools.” It’s “know what you’d lose if they disappeared tomorrow, and check whether you’ve been quietly losing it anyway.”

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