What is used to keep the hole cleaned out during drilling?

The method used to keep the hole cleaned out during drilling involves the use of a bailer. A bailer is a device specifically designed for the removal of slurries, cuttings, or other debris from the drilled hole. It works by utilizing a tubular structure that allows material to be collected and lifted from the bottom of the well or hole, ensuring that the drilling process is not impeded by accumulated waste. This continuous removal of debris is essential for maintaining an efficient drilling operation and protecting the integrity of the hole.

Using a shovel, vacuum, or pump may not be as effective or appropriate for this specific function in the context of drilling operations. A shovel would be impractical for removing material from deep holes, a vacuum may struggle to handle the types of material typically found in drilled holes, and while a pump can remove liquids, it is not designed for the removal of solid debris, which is essential during the drilling process. Therefore, the bailer is the most suitable and effective tool for keeping the drill hole clear of obstructions.