If you're interested in diving, aircraft, or both, how about lending your support to this project:
There is an unused and unwanted Boeing 747 aeroplane sitting on the tarmac at Hongkong International Airport. The airport authority wants to get rid of it and we would like to sink it in HK waters as an artificial reef and scuba diving site.
Visit their website for more info, and to get in touch with them.
There are a few resources that might help: