Uploading Code over Bluetooth Module HC08

I am buidling a subamrine for an Arduino Project this summer and I need a way to program my Arduino Uno Board without the use of any board-to-computer connection (such as via USB port). Currently I am attempting to use an HC-08 BLE Module to send commands to the board.

I am able to connect to the module fine using my laptop (Windows 10) and iPhone but I'm having trouble finding a way to send arduino code wirelessly from my device to the HC-08 mod.

Do you have an idea of of how to send code to it anytime without a wire? Or would recommend a different module or shield in order to program the board?

If you're building a submarine, why choose a technology that is not designed or capable of penetrating significant amounts of water?