She keyed up. “Surface team, Marisol. Radio restored. Sending location now.”
The reply came instantly. “Copy clear. We have the cavers on the emergency channel—they’re forty meters north of you.”
She was three miles into an old copper mine, leading a rescue team for two lost cavers. The radio had been flawless for years: rugged, clear, reliable. But six months ago, Vertex released firmware update , fixing a subtle trunking handshake bug. Her unit was still on v2.04.
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