I took it to the only open water available this time of year for a quick test and everything functioned well ill. Take it ice fishing in the next few weeks, its easy to use, and i had no problems controlling and maneuvering it in the calm, cold, water. The water was about 33 degrees and didnt affect the drones operation. Tether cable management is the hardest thing to learn about this drone. A single person can get the hang of managing the tether, but i had help during most of the test you dont want to. Let too much tether out at a time because it can get caught on submerged things. If you really love the product in this video say, i love gladius mini underwater drone in the comment section for more information like prices, product details and getting your questions answered about the product check.