The Ngong Shuen Chau Naval Base of the Chinese People's Liberation Army (PLA) Hong Kong Garrison held an open day on Sunday, the 31st time since 1997. /VCG Photo

Over 780,000 civilians have participated in the event over the past 22 years. /VCG Photo

Participants enjoyed a feast of Chinese food at the garrison's open day. /VCG Photo

PLA soldiers explained to visitors ,during their tour how to perform first-aid treatment. /VCG Photo

The Ngong Shuen Chau Naval Base is based on the southern shore of Stonecutters Island. /VCG Photo