A prominent youth basketball coach in Iowa could face up to 180 years behind bars after investigators found him in possession of nude images or videos of at least 400 boys.

Greg Stephen of Monticello, Iowa, pleaded guilty Thursday in federal court to five counts of sexual exploitation of minors, one count of possessing child pornography and one count of transporting child pornography, according to the Des Moines Register.

Investigators said they found more than 400 folders containing videos of nude boys on an external hard drive belonging to the 42-year old Stephen, a respected figure in the youth basketball community in Iowa.

According to a 19-page plea agreement filed Thursday afternoon, Stephen’s years-long string of activities included posing online as teenage girls to coerce boys to send him explicit images. He also made secret recordings of players showering during team trips and recorded himself touching players as they slept.

Stephen — the co-founder of the Iowa Barnstormers, an Adidas-sponsored AAU team that is considered one of the best in the state — was arrested in March. An investigation had begun in February after Stephen’s former brother-in-law found a recording device while remodeling Stephen’s home. He turned it over to police after discovering it contained multiple videos of boys showering. Investigators say they found more than 100 clips on the device.

Stephen had secretly used other devices designed to look like a bath towel hook and a smoke detector to record players in his home and lake cabin.

He will face a minimum of 15 years of prison and a maximum of 180 if the sentences for each crime are run consecutively. A sentencing date has not yet been scheduled.