What was the last Aphex Twin album released before his decade-long hiatus?

The last Aphex Twin album released before his decadelong hiatus was "Drukqs." It was released in October 2001, and the reason behind his hiatus remains somewhat unclear. However, speculation suggests that Richard D. James, the man behind Aphex Twin, wanted to take a break from the intense music industry and focus on different creative endeavors. During this time, he did continue to produce music under various pseudonyms and eventually returned to releasing new Aphex Twin material in 2014.