- You can't build a mile tall tower though. - Keeping water out of a hole is a solved problem. - as discussed in other comments here, adding more height gives

- You can't build a mile tall tower though. - Keeping water out of a hole is a solved problem. - as discussed in other comments here, adding more height gives you more PE for the same amount of weight so it's a very valuable investment that pays profits over 20-100 years for your one time investment. https://docs.google.com/presentation/d/17FI-jrI9RWS3q7Ng44YhiHs7il8JvnxK-cV6_g_-cGo/edit#slide=id.g844fb8814b_1_136 https://docs.google.com/presentation/d/17FI-jrI9RWS3q7Ng44Yh...