Flotsam drifts on artificial tides in a remote coastal outpost. Document what happened to the crew of this sea-struck facility, or add yourself to the ledger.

When the anomaly appeared at the Earth's core, the Substratum Protocol was initiated. You are the best and brightest scientists we have left, our last hope to stem the apocalypse. You are the Substratum Expedition Team. Descend. Learn. Survive.