У вашего броузера проблема в совместимости с HTML5
Building an Underwater Base in creative mode, to know how to design it in non-creative. Will take a long time, but I'm more than willing!
-After looking over, I found a slight design flaw. I'll be changing the gaps to 4 blocks rather than 5, so I can add intersections when needed. This change will make expanding the base easier, and so much less of a headache.