Scuba Diving
Scuba Spots [w]
Directory of scuba-related sites and resources worldwide, classified by country and region.
Link Type: redirected
Cost? Free (reciprocal link required); Paid (several options available)
How to submit: Scuba Spots is a little counterintuitive when it comes to submitting a URL. You have to drill down by continent, country and then by region before the "Add Listing" link will actually accept a new listing.
ScubaLinx [w]
Directory and search engine for scuba diving resources.
Link Type: redirected
Cost? Free; Paid (multiple levels)
Submission info: here
If any of the above information is incorrect, or you know of other quality resources that should be listed here, please get in touch.