The discovery of several massive, new chambers which could be accessed by the same opening in Parc Pie-XII, was pioneered by Daniel Caron and Luc Le Blanc, who spent time searching and digging towards the new sections that they had suspected might exist since 2014. On October 12th, 2017, the two recreational spelunkers extended the length of the SLC’s navigable section to approximately 250 meters, when they opened up several new large chambers beyond what was previously believed to be the SLC’s ultimate extent. In this section of the SLC, a small aquifer and underground spring can be found, as well as small stalactites and undisturbed strata in limestone walls, where large and distinct calcite deposits also stand out. The ceilings in this new section are exceptionally high.

Prior the discovery of the new SLC sections, Caron and Le Blanc used a technique known as radiesthesia to investigate and confirm their suspicions that other open chambers existed beyond the old SLC’s walls. Radiesthesia is said to function via the use of a calibrated instrument that is sensitive to the presence of something such as running groundwater, or in this case, open cavities in Earth’s crust. The holder of the instrument is alerted to the presence of what he or she seeks by the handheld tool. Access to sections of the newly discovered SLC remains restricted, and members of the public are not generally allowed entry at this time. However, the Advanced GIS class (ESG 362) at Bishop’s University is in the process of providing digital access to this site by way of an interesting mapping technique and digital reconstruction process.