In a few past years climat change advances at an alarming rate. It is becoming more possible that people will look forward to living on a water soon. Firstly, due to increasing level of water on our planet, and secondly, because of the human overpopulation. Living on a water comes with new possibilities. Underwater parts of a city may work similar to the parts exposed to the direct sunlight. Thanks to the Hybrid Solar Lightning it is possible to transfer daylight deep into structure of the city.