A Michigan man was sentenced today to five years in prison for possessing over 41,026 images and videos of child sexual abuse material (CSAM). He was also ordered to pay $63,000 in restitution.

According to court documents, David Mark Bartels, 38, of White Cloud, admitted to purchasing collections of CSAM while he was employed at Naval Station Guantanamo Bay. Forensic review of a five-terabyte hard drive seized from Bartels revealed tens of thousands of CSAM files within the folder “\NSFW\Nope\Dont open\You were Warned\Deeper.” These files included 1,500 images and videos of 285 known victims. Bartels used the Tor browser, which allows users to surf the dark web, to access images and videos of CSAM, including content depicting bondage, domination, and sadomasochism.