2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/6958We briefly summarize the survey of HI 21 cm emission lines to search for shocked atomic gas associated with Galactic supernova remnants (SNRs) in the southern sky. For G347.3-0.5, we discuss the distance to the SNR and the implications of the HI results.2 pages, to appear in "Young Neutron Stars and Their Environments" edited by B. Gaensler & F. Camilo (ASP Conf. Series)Astrophysicstext