Earthgrid (Plasma-Torch Boring)

Bay Area startup developing plasma-torch boring rigs. Technology: 48,600°F torches arrayed in a Fibonacci spiral to vaporize hard rock without mechanical cutter heads. Claimed cost economics as low as $300/meter.

Represents A parallel competing technological pathway to TBC's mechanical Prufrock TBM at the same sub-grade infrastructure substrate.

Forward-watch: cap-table verification needed to test whether Earthgrid's investors overlap with TBC's Founders Fund / 8VC / Sequoia operator-class cluster (which would strengthen the operator-class hedged-bets reading) or whether the funding is independent (which would calibrate the hedged-bets thesis downward).