Waterproofing Keyless Ignition Key

[Garlandcs]

Help. I want to take the ignition key with me in the ocean, but am not able to lock the car if I leave the electronic fob in the vehicle. Any ideas on how to either waterproof the fob or override it somehow? If you have ideas let me know

[1990LS400]

Google something like "waterproof key case" and buy online or visit a general sporting goods store or a dive shop that sells scuba equipment. We've got a bunch of waterproof bags and cases from tiny to duffle bag size and all of them came from stores like I mentioned.