Talk:Addermire Institute/@comment-43588473-20190822182121/@comment-16533050-20190824072208

Upon investigation, the basement seems to have been sealed some time after Duke Luca confined Hypatia to Addermire.

This would make it it approximately 1847-1849 for the earliest. The game takes place in 1852, so the basement was sealed for 3-5 years at maximum depending.