My 3 year old Mavic Pro disappeared during a flight earlier today. I was flying over land and sea in excellent weather conditions for about 18 mins with enough battery power to easily return to home. From the flight records, it appears that it fell into the sea. After losing communication, I tried the RTH but got the "No Return to Home" indication. I have attached the flight Log with the hope that someone can do an analysis and let me know what really caused this failure. Thanks in advance for your help.