In the evening, a few dock workers did not leave directly after their shift; they walked around outside for a while and then returned to the dock.
The dock hosts a large number of people and goods daily, and to keep it clean and tidy, water pipes and faucets can be found everywhere, including outside every warehouse.
Once the lease term of a warehouse expires, the goods inside will be removed. The next renter might have certain hygiene requirements, so they'll clean the warehouse, and that's why water pipes and faucets are readily available.
The group used a key given to them by someone else to open a side door of the Liji Group's warehouse, which was piled high with wheat, simply heaped together.
The room was a bit stuffy; they only turned on a small light and then started working.
They connected the hoses they brought to the faucets, then climbed the warehouse's high staircase and began watering the wheat from above.