21 July 2016
Ye Guangfu made his first public appearance on 20 July, just after completing the European Space Agency (ESA) underground training course CAVES (Cooperative Adventure for Valuing and Exercising human behavior and performance Skills), a training mission deep in an Italian cave. Ye and five other prospective astronauts from Japan, Russia, Spain and the United States spent six nights in Sardinian caves from July 1 to 7, simulating a mission to another planet. The mission focused on multi-cultural approaches to leadership, following orders, teamwork and decision-making, according to ESA.
MORE...

CAVES website on the ESA portal...