Hello
I live in a 1920s house that has a small cellar (3100 x2400mm x 1950 high) that is lined with brick walls. Looks like there is a moisture problem, with what looks like efflorescence on the bricks?
the otherwise of the bricks is soil and not accessible


Are there any suggestions how to treat the bricks?
Is it possible to put in a damp proof membrane?
Thank you