If you fancy a trip to Japan then you can dive Yonaguni:
http://www.morien-institute.org/yonaguni.html
In April it also has schooling Hammerhead sharks. The dive itself is supposed to be amazing although I have yet to do it.
http://www.morien-institute.org/yonaguni.html
In April it also has schooling Hammerhead sharks. The dive itself is supposed to be amazing although I have yet to do it.