sentences:  Giant devil rays are usually seen in deep coastal waters but are occasionally seen in shallow waters.In a tagging experiment conducted by the Italian National Institute for Environmental Protection and Research (ISPRA), three giant devil rays were tagged and their depth was observed throughout different times of the day.The rays reached a maximum depth of 600-700 meters (1960-2300 feet) but mostly spent their time between 0 and 50 meters (0 and 165 feet); they prefer warmer waters with a temperature between 20°C and 29°C (68°F and 84°F).