For the purpose of the short story that I am writing I have come with an idea of a mud-brick small building (base floor + top floor, just a few rooms), lost somewhere in the north Nigeria. The building is in a very close proximity (about 30-50 metres in a straight line) of a lake. For the sake of the story told building must be equipped with a basement or any other underground / below ground room.
Is this possible at all? Am I able to build anything brick-like in a damp, watery ground like you would expect in a such proximity to a lake? Would foundations and general construction guides allow such construction? If not then what is the closest distance to a lake where such building could be safely built and exist?
Temperatures in north Nigeria varies from 23 degrees Celsius during wet season to up to 40 degrees Celsius just a few last weeks of the dry season, just as a wet season is about to come. Overall air humidity during wet season can be as high as 80 percent. If that matters.
The humidity of such cellar is not a problem for me / for my story, as long as such underground room can safely exist and would allow to carry some weapons and firearms in such conditions.
I have found and read through following questions, but I don't get direct answer to my question there:
I am a complete newbie to a house construction-like questions, so sorry, if this one is naive or off-topic here. Thank you.