On February 28, 2023 Chinese cosmonauts Fei Junlong and Zhang Lu performed the spacewalk to install an instrument with 20 plugs. Fei Junlong had to connect almost 40 data lines to the Tianhe module. This required removing a protective cap from each socket and then inserting a rectangular plug with almost 50 contacts into the respective socket. The EVA lasted 7 hours and 50 minutes. It was the 2^nd spacewalk for both Fei Junlong and Zhang Lu. It was a secret spacewalk. It was the 10^th EVA of Chinese space program.