Bucket brigade
A bucket brigade or human chain is a method for transporting items where items are passed from one stationary person to the next.
The method was important in firefighting before the advent of hand pumped fire engines, whereby firefighters would pass buckets to each other to extinguish a blaze. A famous example of this is the Union Fire Company. This technique is still common where using machines to move water, supplies, or other items would be impractical.