Interactive Coverage Surface — Fairbanks 2026 §6.6

Depth and duration grid. Starting BCR to clear primary failure (BCR<1x). Holds time-at-depth shape constant at pooled (τ, σ) = (0.6799, 0.2073).

Drag to rotate. Pinch to zoom. Use the camera icon to save a PNG. True North build, rendered from outputs/surface_grid.csv in the author's MIT-licensed repository. See Fairbanks 2026 §6.6 and Appendix C for methodology.