--- title: "TSMC broke its own rule to add a 3nm fab. Two days later, four workers died." description: "On October 19 TSMC broke a decades-old rule to add a fourth 3nm line, and on October 21 a scaffolding collapse at its Kaohsiung site killed four workers and stopped some construction. The 2027 and 2028 AI chip schedule now sits on an island where the buildout just cost four lives." publisher: "The Inference" section: "Silicon" published: 2026-10-21T13:56:49.432Z modified: 2026-10-21T13:56:49.432Z canonical: https://theinference.org/article/tsmc-broke-its-own-rule-to-add-a-3nm-fab-two-days-later-four-workers-died language: en keywords: "TSMC, Semiconductors, Labor, Supply Chain, AI Chips, Taiwan" --- # TSMC broke its own rule to add a 3nm fab. Two days later, four workers died. > On October 19 TSMC broke a decades-old rule to add a fourth 3nm line, and on October 21 a scaffolding collapse at its Kaohsiung site killed four workers and stopped some construction. The 2027 and 2028 AI chip schedule now sits on an island where the buildout just cost four lives. On October 19, 2026, [TSMC](https://theinference.org/markets/companies/tsmc) chairman C.C [1][2]. Wei told investors his company was doing something it does not do: building more capacity for a chip node that had already hit its target. "In the past, it was common not to further expand capacity once a specific node's capacity reached its target," Wei said [on the third-quarter earnings call](https://biz.chosun.com/en/en-it/2026/10/19/7MAL7PYS7FAIJLWGOFKOYHCH2Q/). AI demand made TSMC break its own rule, adding a fourth 3nm plant, a second dedicated line in Tainan set for mass production in the first half of 2028 [1][2]. Two days later, the bill for speed came due. Bloomberg reported on October 21 that TSMC [suspended some construction at its Kaohsiung fab site](https://www.bloomberg.com/news/articles/2026-10-21/tsmc-suspends-some-construction-after-deadly-accident-kills-four) in southern Taiwan after a scaffolding collapse killed four workers [3][4]. ## The proof the rule broke is in the numbers The cannibalization is the tell: TSMC is converting part of its existing 5nm production line in Tainan to 3nm, taking capacity out of one node to feed the queue at another [1][2]. The pull is visible in the revenue mix. 3nm rose to 33% of wafer revenue in the third quarter, up from 30% in the second, and advanced nodes together carried 79% of it [1]. Q3 revenue came in at NT$1,494,243 million, up 50.9% year over year, with operating profit up 75.0% [1]. *Chart: **Revenue has climbed ten straight quarters as AI demand builds** Line chart of TSMC quarterly revenue, Q1 2024 to Q2 2026, rising from $18.5B to $39.8B* *TSMC quarterly revenue, US$ billions, from its SEC filings, Q1 2024 through Q2 2026. The third-quarter figures in the text are reported in NT$ and differ in scale and basis. [7]* ## The money is already committed to the south TSMC's 2026 capital plan is $60 billion to $64 billion, with [2026 to 2028 investment set to "far exceed" the prior three years](https://theinference.org/article/goldman-lifts-tsmc-s-2028-capex-to-98-billion-while-pushing-the-texas-payoff-past-2032) [1]. The southern corridor carries the load: cumulative investment in the Tainan science park exceeds NT$1.86 trillion across 20 plants and more than 11,300 direct jobs [1][2]. [Nvidia](https://theinference.org/markets/companies/nvidia) and [Apple](https://theinference.org/markets/companies/apple) take an estimated 65% of TSMC's 3nm output, and only TSMC yields above 90% there, against roughly 60% at Samsung's rival 2nm process [2][5]. That is why Nvidia [put all three of its HBM base-die suppliers on TSMC's 3nm](https://thenextweb.com/news/nvidia-nvhbm-samsung-tsmc-3nm-base-die-sk-hynix-micron), and why [Apple is locking the first wave of TSMC's 1.4nm](https://www.androidheadlines.com/2026/10/apple-secures-tsmc-1-4nm-chip-capacity.html) [5][6]. *Chart: **TSMC holds 72.5% of the foundry market, 66.6 points clear of Samsung** Pie chart of Q2 2026 foundry market share: TSMC 72.5%, Samsung 5.9%, remainder 21.6% (derived)* *TrendForce Q2 2026 foundry revenue share, percent. TSMC 72.5% and Samsung 5.9% are stated figures; the remainder is arithmetic, not a reported figure. [1]* ## What the suspension does not touch Bloomberg does not say which structure was stopped or for how long, and the Kaohsiung site is not the Tainan complex where the 3nm lines sit [1][2]. The 3nm schedule stands as Wei laid it out: Tainan in early 2027, Arizona pulled forward to Q3 2027, Kumamoto in 2028, the new Tainan fab in early 2028 [1][2]. But a buildout Wei describes as "expanding capacity at an unprecedented pace" [1] now carries four dead workers on the same island, and every date above assumes construction keeps running at that pace. Watch Kaohsiung's safety reviews and permitting next: that is where the schedule and the human cost meet. ## Takeaway TSMC broke its own no-expansion rule to add a fourth 3nm line on October 19; two days later a scaffolding collapse killed four workers and suspended some construction at its Kaohsiung site. The 3nm schedule is untouched for now, but every 2027 and 2028 date assumes the unprecedented buildout pace holds and Kaohsiung's safety reviews clear. ## Sources 1. [ChosunBiz, TSMC adds Taiwan 3nm plant as AI chip demand surges, targets 2028 ramp, 19 October 2026](https://biz.chosun.com/en/en-it/2026/10/19/7MAL7PYS7FAIJLWGOFKOYHCH2Q/) 2. [East Asia Brief, TSMC plans new 3nm Tainan fab as AI accelerator demand surges, 21 October 2026](https://eastasiabrief.com/semiconductors/tsmc-plans-new-3nm-tainan-fab-ai-accelerator-demand-822) 3. [SemiDoped Daily Update, 21 October 2026](https://daily.semidoped.com/p/daily-update-october-21st-2026) 4. [Bloomberg, TSMC Slows Taiwan Construction After Accident Kills Four, 21 October 2026](https://www.bloomberg.com/news/articles/2026-10-21/tsmc-suspends-some-construction-after-deadly-accident-kills-four) 5. [The Next Web, Nvidia reportedly wants all its HBM suppliers to use TSMC's 3nm process, 20 October 2026](https://thenextweb.com/news/nvidia-nvhbm-samsung-tsmc-3nm-base-die-sk-hynix-micron) 6. [Android Headlines, Apple Moves to Buy Out TSMC's Entire First Wave of 1.4nm Chips, 20 October 2026](https://www.androidheadlines.com/2026/10/apple-secures-tsmc-1-4nm-chip-capacity.html) 7. [TSMC, quarterly figures from its SEC filings, retrieved 21 October 2026](https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001046179) --- TSMC broke its own rule to add a 3nm fab. Two days later, four workers died. — The Inference. Canonical: https://theinference.org/article/tsmc-broke-its-own-rule-to-add-a-3nm-fab-two-days-later-four-workers-died