Apparatus pool cleaner has extractable filtration device from a side wall

The invention relates to a surface cleaning apparatus immersed in a liquid, in particular a swimming pool cleaning robot, comprising a body, said body having top, bottom and side walls configured such that said lower wall is intended to be positioned opposite the submerged surface on which the camera moves (10), said top wall opposite said bottom wall, said side walls connecting said bottom and top walls, means for moving the body (11) on said surface submerged. Said apparatus also comprises a central chamber (15), located inside the body (11) and having a filter basket (151), said filter basket (151) having a filter wall, and an opening ( 113) for extracting said filtering basket (151) of the body (11). Furthermore, said opening (113) is arranged on a side wall of the body (11).