Have you ever seen people cutting through metal with water? Well water has been able to break and make things since the dawn of time. You can see beaches change shape with the water splashing on the rocks every day in the form of waves. And it takes a long time but water does the job. But if you were to pressurize water into a very powerful stream, you could easily cut metal with it. And some people do it that way, although it is a very slow process. But it does reduce destructive tendencies in other forms of cutting. Also the cutting method is very clean and the water is reused. That is how modern day hydro excavation is performed as well. By using a very strong pressurized jet stream of water, you can dig into the surface of earth without harming or damaging the environment. Since there are chances that the surroundings are sensitive and other forms of digging may disturb the surroundings.
It is the more safe and environment friendly method of cutting into the ground and reaching a specific place in the ground. It does not require breaking the whole ground apart to fix a problem. It pinpoints a specific area and then digs into it using water pressure which does not cause damage to the surrounding area. It only penetrates deep into the area in question. The water pressure is very powerful and is pinpointed towards a single point. That is what hydro excavation is for. But when you are using a powerful drill, it displaces the surrounding soil and disturbs the whole area. But water pressure penetrates without drilling action through pure pressure and power.
Modern Science and Technology
This form of digging has been lately preferred when you require precision. Also in some places a drill just does not cut it that is where hydro excavation can work wonders. This might have seemed impossible, using water to dig a hole in the ground. Water is not even hard, it is a liquid and thinking about how it can cut a hole in the ground is just something no one would expect. But with modern day science, you can pressurize the water so much and release it with so much pressure through a single opening that it creates a jet stream. This jet stream can cut into metals and is also used for digging into ground.
The process of hydro excavation is far less destructive and does not require any heavy machinery. Just a very high powered motor that releases water in the form of a jet stream and a professional to operate it would be more than sufficient for the job.