While among the countries participating in the International Space Station project there is a discussion of plans for the future, that is, to close the ISS or continue its work after the completion of the planned period of work, many states, for example, Russia, China, Japan, the United States are already thinking about space stations of the Moon and even the Red Planet.
For example, Lockheed Martin recently presented a project of a spacecraft that can be placed in Mars orbit in the near future (at least, the designers themselves are for some reason absolutely sure of this).
The Mars project already has a name - Mars Base Camp. In addition to the station itself, he assumes the MADV apparatus, with the help of which astronauts can periodically descend to the surface of the Red Planet. The module is four-seater, for a soft landing it is planned to use engines like those used today on the Falcon 9, and the NASA Orion spacecraft will become the prototype of the device itself. MADV will operate on liquid oxygen or hydrogen. All the necessary components can be obtained from water by splitting it with the help of solar energy.
In the long term, Lockheed Martin plans to develop another transport spacecraft needed to deliver water to its Martian space station, most likely from nearby asteroids.