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Input: But on July 9 of that year   prominent Beijing rights lawyer Wang Yu  disappeared  along with  her  husband  also a lawyer  and their teenage son.
The following day  police raided  Wang 's law firm and detained seven of  her  colleagues. Seven other rights lawyers were also detained or reported missing  according to the Hong-Kong based China Human Rights Lawyers Concern Group  which has meticulously documented the cases. It became known as the "709 crackdown" -- a reference to the date the first arrests occurred.
 Sui  was among them.  He 'd earlier in the day spoken to two foreign media outlets to raise concern about  Wang 's disappearance.
That night  a security guard called up to Sui's apartment and said  his  car had been scratched in an accident and when  he  stepped outside  a group of police quickly whisked  him  away  said  Sui .  He  wasn't seen again for nearly five months.
Two days later  on July 12  the same thing happened to  Chen .  He  said police asked  him  to come down from  his  apartment to answer a few questions. "I intentionally left my cell phone upstairs in my apartment because I thought I'd be back in a few minutes."  He  didn't return for six weeks.
Dahlin says he was accused of masterminding a plan to smuggle the son of Wang Yu  the first lawyer to be detained in the swoop  into Myanmar  in an effort to evade authorities in October 2015.
After a month   Chen  said  he  was told to collect  his  belongings.  He  thought  he  was going home -- but instead was driven to what appeared to be an abandoned hotel and held for another 10 days.
Earlier this year  CNN visited the nondescript building where  Chen  said  he  was held in Guilin  a southern city famed for its stunning landscape of karst mountains. Signs posted around the area in Chinese and English marked it as military property  but it otherwise appeared open and accessible.
Sui says he admitted to charges of inciting subversion.  Chen  told CNN  he  confessed to charges of picking quarrels and provoking troubles  inciting subversion and embezzlement.
"You have to confess "  Chen  said. "Otherwise they won't let you go."
"Early on it was quite extreme. Every little noise at night would wake me up. I'd sleep with a knife next to my bed  ready to stab the first Chinese person who comes into my gate "  he  said.
 Wang Yu  poses during an interview in Hong Kong on March 20  2014.
 Wang Yu   the first lawyer detained in the 709 crackdown  was charged with subversion  while  her  husband was charged with inciting subversion. They were both released on bail after more than a year in custody  after  Wang 's taped confession was aired on CCTV.
In it   Wang  renounced  her  legal work and blamed "foreign forces" for using  her  law firm to undermine and discredit the government. Their son  who was detained along with them  was released soon afterward  but his movements have been heavily restricted.
Authorities never aired  Chen 's statement.  He  was released a day after recording it and the charges against  him  were dropped.
"I have no criminal record  but they can still use the video to discredit me "  he  said.

The disappeared: Accounts from inside China's secret prisons