The depopulation of Japanese local areas by aging has been quickly going. Suo-Oshima-cho where the Oshima National College of Maritime Technology is located in is not also exception. The population was 65,000 in 1947 and became 19,000 in August, 2010. A gregarious area of peculiar corals to East Asia was discovered recently in the sea area around Suo-Oshima. The scale is 40m×20m, and it is world maximum grade. It is said the influence of greenhouse effect by CO2. However the authors regard the discovery of peculiar corals as a good opportunity to increase tourists by the coral sightseeing, and completed to improve a conventional fishing boat to a hybrid-powered glass boat. In this paper, the summary and the erformance are reported.