In the world of Belitopia, Tycho Base was built as a series of four “pods”. These four pods were connected via short tunnels between them in a straight line format with two pods acting as the end caps of the line.
Each pod was approximately rectangular in surface area, and had a flat underbelly with a curved top. They looked very similar to a Hostess Ho Ho.
Each module was 45 feet long and 15 feet wide. They stood 12 feet tall. Each had a single floor where humans could walk inside in a shirt sleeve environment. The habitation area in most of the modules had an inside height of 9 feet. The extra room above the ceiling was used for storage.
The tunnels were simple connecting tubes large enough for a human to walk upright inside them, and wide enough to pass another person going the opposite direction, but they contained no room to store equipment nor material.
Each of the four pods that comprised the base had a separate primary purpose.
Pod #1, the pod on the south-most edge of the base, was the utility pod. It was sometimes called the garage pod. This pod housed the primary airlock used to go from the shirt sleeve environment of the rest of the base. The pod had the space suit closet, where all the space suits were stored and serviced. This pod had the primary machinery for pressuring the entire base and storing the necessary non-food consumables used by the base. This included oxygen, hydrogen, and the fuel cells needed to make electricity and water, along with the recycling plant for recycling the water for reuse. Food was the only consumable not stored in this pod. This pod was also where tools and equipment were stored that were designed to be used outside the base in the open lunar surface. Many of those were stored in bins that were not pressurized in an external facing side of the pod. This capability is why the pod was sometimes called the garage pod.
Pod #2, the next pod over in the pod chain, was the research and control pod. This was the heart of the base. This pod contained the control room and all the equipment for managing all base operations, along with the communications equipment for communicating with earth. The pod also contained the primary research facilities that were available to the crew of the base. Most of the day-to-day operations and management occurred in this pod.
Pod #3 was next in the line. It was the health and fitness pod. This pod was where the crew could excersize and work out in order to keep fit and toned in the low gravity environment. It did not have the above ceiling storage area, and so the ceiling was over 11 feet high. This gave plenty of room for exercise and other fitness activities. It contained many different types and styles of exercise equipment along with systems that could monitor the health of the crew. It was also the home of the medical bay, where medications, medical equipment, and medical supplies were stored. Routine and emergency medical care was available here, and all crew members were trained to perform relatively advanced medical care.
Pod #4 was on the northern-most edge of the pod string. It was the living and eating quarters. This was where the astronauts would sleep and relax. Shower and restroom facilities were available here, along with kitchen and food preparation capabilities. An entertainment area and sleeping areas were also available. When the crew was not working, and were not exercising, this was where they spent the majority of their off time.
Pod #4 also had an emergency egress airlock, along with the storage for emergency space suits. If the crew was cut off from the main egress on the southern end of the base — in the utility pod — during an emergency, they could put on the emergency space suits and exit out the emergency airlock on this northern end.