An algal bloom of dinoflagellate illuminates sea water, turning it bright blue at the coast in Dalian city, Northeast China's Liaoning province, June 4, 2018. (Photo: IC)

An algal bloom of dinoflagellate illuminates sea water, turning it bright blue at the coast in Dalian city, Northeast China's Liaoning province, June 4, 2018. (Photo: IC)

An algal bloom of dinoflagellate illuminates sea water, turning it bright blue at the coast in Dalian city, Northeast China's Liaoning province, June 4, 2018. (Photo: IC)

An algal bloom of dinoflagellate illuminates sea water, turning it bright blue at the coast in Dalian city, Northeast China's Liaoning province, June 4, 2018. (Photo: IC)

An algal bloom of dinoflagellate illuminates sea water, turning it bright blue at the coast in Dalian city, Northeast China's Liaoning province, June 4, 2018. (Photo: IC)

An algal bloom of dinoflagellate illuminates sea water, turning it bright blue at the coast in Dalian city, Northeast China's Liaoning province, June 4, 2018. (Photo: IC)