They eventually stopped arguing about whether the past could be changed. That debate belonged to an earlier phase, when spacetime was treated as sacred and causality as something that required paradox-prevention mechanisms. Grandfather paradoxes, self-consistency constraints, closed timelike curves. All of it assumed a universe that demanded a single, globally coherent history.

The civilization that finally exploited faster-than-light signaling learned something different. History did not need to be self-consistent. It only needed to remain navigable. They called it the spiral.

Long before they were a Kardashev civilization, their physics had already accepted uncomfortable facts. Bell had killed locality. Pilot-wave theory made nonlocality explicit. Under quantum equilibrium that nonlocality was sterile and non-signaling, reproducing everything ever measured. Valentini showed this behavior was contingent rather than fundamental, a property of equilibrium rather than a law written into reality itself.

Breaking out of that phase did not resemble crossing a threshold. There was no dramatic event. Instead there was a gradual realization that with sufficient quantum coherence stabilization, tiny statistical biases could be detected. Not cleanly or cheaply, but inferentially, by systems designed to notice deviations so small they vanished unless expectations were adjusted. The first usable deviation from the Born rule did not transmit a message. It merely made one future slightly more likely than another.

The key insight was this: faster-than-light signaling does not overwrite history. It branches it, but only along directions that preserve navigability. Attempts to force large changes failed. The universe did not forbid change; it simply refused to stabilize configurations that demanded global consistency.

Time was no longer a line or a tree. It was a helix. Each intelligent intervention nudged the system into a neighboring trajectory. The past remained compatible with itself, but it was no longer identical. Nothing prevented contradiction in principle. What prevented chaos was cost. Branches that diverged too sharply lost coherence and became unreachable. The civilization learned to make small, deliberate divergences, enough to change outcomes without losing contact.

There were loops, but they were not closed. An intervention from the future could bias a past experiment whose altered result changed the future system that sent the bias. Not by contradiction, but by drift. Each pass landed on a slightly different layer of the spiral.

This could not happen accidentally. A nuclear reactor can be built without deeply understanding fission because the amplification is automatic. The spiral could not. Exploiting nonlocal signaling required intelligence. Without intelligence there was no spiral, and causality looked classical.

They tried to dominate. Expansion multiplied variables, destroyed coherence, and collapsed branches. Rigid goals shattered navigability. They learned that a civilization using time spirals to dominate selects itself out of the spiral. Survival required restraint, so they became local, dense, internally sophisticated, and externally boring.

To younger civilizations still debating whether faster-than-light communication is allowed, the universe appears unchanged. Relativity works. No-signaling holds. Causality looks intact. Only when nonlocal realism is accepted honestly, as pilot-wave theory does, does the door crack open.

The civilization did not fix the past. It outgrew it. History became navigable rather than sacred. Time became another dimension that demanded engineering discipline. If the spiral exists, it does not announce itself. It ensures that the futures capable of finding it are never the ones that shout.

A concise argument for why this view is cleaner rather than wilder than current QM interpretations is here:

https://magarshak.com/blog/why-pilot-wave-theory-deserves-a-second-look/

The Time Spiral:How Quantum Error Correction Enabled Faster-Than-Light Signaling