ARCHAOS is the first state-of-the-art Scanning Tunneling Microscope (STM) in the Davis Lab at the Laboratory of Atomic and Solid State Physics at Cornell University. The enclosed room is air-floating and soundproofed, allowing ARCHAOS to work in an ultra-low noise environment and collect high-quality data. This STM is equipped with a 9 Tesla magnetic field, designed to cleave samples at 4 K, in situ tip preparation, and can work at a temperature of 280 mK for serval days at a time. The control room, though adjacent, is completely isolated from the STM, ensuring a timely and efficient operating environment. ARCHAOS aims to explore and understand the quantum world at the atomic scale, especially focusing on unconventional superconductivity, Bogoliubov quasi-particle interference, topological superconductors, and pair density waves.