香港喺1980年10月取消抵壘政策，採取即捕即解政策，一班中國大陸非法入境者趕喺三日寬限期之內，用遊水、撐船等方式偷渡到香港申請身分證。佢哋喺邊境地區俾「打蛇集團」綁架，凌辱、虐待佢哋，逼佢哋講香港親戚電話號碼，以收取贖金。最後，「人蛇」反抗，打贏「打蛇集團」，逃出生天，不過最後都係唔好彩俾警察捉到。
In October 1980, Hong Kong abolished the arrival policy and adopted a policy of immediate arrest and dismissal, and a group of illegal immigrants from Chinese mainland rushed to Hong Kong to apply for identity cards by swimming and boating within the three-day grace period. They were kidnapped by the "snake fighting syndicate" in the border area, humiliated and abused them, and forced them to tell the phone numbers of their relatives in Hong Kong in order to collect ransom. In the end, the "stowaways" resisted, won the "snake fighting group", and escaped, but in the end they were unlucky to be caught by the police.