Не возможно построить в глубоком океане

Since Update 10 building in deep ocean is no longer possible, you can change that via setting in Difficulty.eco: "AllowDeepOceanBuilding": true,

This configuration option can only be changed via the config files of the server. The local server can be found in /Steam/steamapps/common/Eco/Server. The configs are in the configs directory.