Great! Can you please elaborate? Particularly about equipment costs and stuff?
Cost is a complicated and depends on the situation but a very simple case probably would be somewhere between $5000-20000 per user for data cable for a simple run presuming there were multiple users along the route. High power lines can be far more expensive. Underground cable is somewhere between 4-8X as expensive to lay as overhead cable. The biggest costs are typically the civil engineering involved. Especially if you have to dig up or work around any existing infrastructure.
Equipment? Depends on what you are doing and where you are doing it. Ignoring the equipment to hook into existing infrastructure you're looking at trenching equipment, cable feeding equipment, and a variety of other goodies. You also have to watch for buried power, data, gas, water, and sewer lines which aren't always well documented. Dig by hand? Don't make me laugh. To do it right you have to lay the cable below the frost line in most cases which can be several feet deep in many places. I know code near me for a simple drop requires a minimum depth for cable TV cable of 18 inches.