Male sailors aboard the USS Wyoming secretly recorded their female shipmates showering several times a day for almost a year—sometimes working in teams to prevent detection, says a new Navy Times report out this week.

At least 12 male officers were implicated in the ring, which operated for about 10 months before a electronics technician on another ship heard about the recordings and reported them. Of those 12 men, 10 were ultimately prosecuted and assigned punishments ranging from hard prison time to a pay cut.

The men were apparently able to film the women through a hole in the wall using cell phones and an iPod Touch—both of which are reportedly banned aboard the submarine. And it was a wonder they had any time left over to do their jobs (via the Navy Times):

One sailor admitted that he and a male peer rushed to secretly record each female midshipman while she was in the shower changing room. They filmed every woman each time she took a shower during the three-month patrol, he said — several times a day, according to a new report.