1, the risk coefficient of tunnel engineering is much greater than that of general engineering. Once safety measures are not in place, accidents will easily occur. This is where this project can make money. As the saying goes, seeking wealth and risks is probably the case.

2. Compared with other projects, the equipment needed for tunnel engineering is more and more expensive. It is that the investment is relatively large.

I don't think anyone can give you good advice on this decision-making problem. This still needs your careful consideration.