Not much information for photographers on their website.
Took a quick look at their collection and noticed one "big name" in underwater photography listed with them, so it might be worth listing your images there, but only you can decide that question.
Some questions I would ask are:
Are they image exclusive?
What percentage of the sale do you get?
How often do you get paid?
Is there a minimum account balance needed to be reached before triggering a payment?
Do you have to sign a contract? How long and what terms?
How do you submit images? Mail or Internet?
Who chooses whether your images are marketed as Rights Managed, Royalty Free, or as Microstock.
Do you actually earn money or "points" when someone licenses your image?
These are just a few questions you might want to ask before deciding whether you would like to submit images for licensing.
Good Luck, hope it works out well for you.