I know it's not really what you mean, but jacket foundations are fairly common in offshore wind. The emerged part is still always a solid tube. https://www.isc

I know it's not really what you mean, but jacket foundations are fairly common in offshore wind. The emerged part is still always a solid tube. https://www.iscpc.org/images/gallery/Jacket_Foundations_EWE.jpg https://www.iscpc.org/images/gallery/Jacket_Foundations_EWE....