1) Oil platform
Found on
https://www.crosswordclues.com/clue/fixed-platform
A fixed platform is a type of offshore platform used for the production of oil or gas. These platforms are built on concrete and/or steel legs anchored directly onto the seabed, supporting a deck with space for drilling rigs, production facilities and crew quarters. Such platforms are, by virtue of their immobility, designed for very long term use...
Found on
http://en.wikipedia.org/wiki/Fixed_platform
No exact match found.
