The Princess Margaret Rose Cave in Victoria's Lower Glenelg National Park, near Mount Gambier, has been closed to public tours since 2021, ABC reported on 8 November 2026. The site, about 2 kilometres east of the South Australian border, is the subject of a $2,135,000 upgrade earmarked for new toilets and work on wastewater infrastructure and the visitor area.

Parks Victoria reported completed work on new cave lighting, handrails, steps and electrical systems. A sign near the car park carried a December 2026 completion date, but the agency's website cited unforeseen contractor availability constraints and a revised construction schedule. Parks Victoria now hopes to reopen the cave in late 2027 — an expectation, not a confirmed opening.

Local tourism operator David Graham described recent construction as a promising sign, while Liberal MP Roma Britnell said the site had been left to fall into disrepair. Graham said repeated delays were hurting the local economy.