Swimming with freestyle libre

Alright i am a diabetic type 1. And i have diabetes for 5 years. Now, i love have a libre sensor and a insulin pump. I love swimming, but libre is a problem when i am swimming. It comes off so easily. Now i know you can swim for 30 minutes safely but i would want to swim for longer. I have tried several things, like some stickers i bought online, they cannot last 2 damn seconds in the sea. And i tried one of those waterproof thingies when you have a open wound, they came off so easily. I live in croatia. The reason i made this post was so i could hear if you guys have any idea to keep my sensor alive. I will appreciate any help since i am despereate.