Diving enthusiasts in Liguria, North East Italy, have launched an experimental underwater basil crop in the hope that they can develop the idea and export basil to drier areas across the globe. Sergio Gamberini, CEO of Ocean Reef, an Italian-American company specialising in underwater communication systems, came up with the idea to grow plants underwater and launched "Nemo's Farm", a project which is in it's fourth season this year.

Three plastic bell shaped structures are set up 8 metres under water, big enough for the divers to stand up in and work without their masks. Evaporation keeps humidity levels at 80 to 90% under the bells, condensation supplies the plants with freshwater, which make the air in their bubbles themselves thanks to photosynthesis. 

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Source: http://www.freshplaza.com/