During a dive, you are suddenly attacked by a sea monster. You find refuge behind a hatch. Will you make it back to the surface? The wreck of the Nautilus is a tricky adventure for puzzle enthusiasts, created by author Arnaud Ladagnous with illustrations by Florian de Gesincourt. The Unlock! series games allow you to experience the cooperative thrill of an escape room visit right at your own game table, thanks to the free app that provides real-time gameplay with sound. A tutorial and five standalone demo scenarios for printing can be found under Bonus for download.