EMX Industries Inc. have been mentioned in this website before, as makers of super-high quality electronic sensors and switching equipment including keypad and proximity control systems.
They recently brought out a new item that might interest you, who have locations that are prone to a lot of rain or inclement weather environments.
The CR 2000 is a waterproof keypad with wiegand wireless hook up and has the option of a proximity sensor too. It is totally waterproof as shown in the next picture.
To all you seafloor dwellers, you can now have super easy to use access control that will work continuously submerged.