Underwater Base?

Great tips/ideas! I went with the pump method in the ocean. Had to build a retaining wall to keep from having to build an ark next. I think it turned out well

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I wanted to build something like this but I can't tell, what block did you use to make this? It looks like something metallic but i can't find anything like it.
 
I wanted to build something like this but I can't tell, what block did you use to make this? It looks like something metallic but i can't find anything like it.

Either copper or tin plating blocks painted white. Not entirely sure which. looks like copper.
 
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