What is the Huo family's unique skill in the tomb robbery notes?

Wu Xie mentioned in his private notes:

Grandpa took the baggage and take the journey, Huo Xiangu doesn't often go to the fields, and their way of going to the fields is very special, similar to the practice in the salt mine before, making a big hole and hanging it upside down on the top of the tomb with a special hook. This practice requires the cooperation of people with very good flexibility and great strength, so the heads of the Huo family are all women, and the status of female assistants is very high.