The phrase "unlimited diving" means that there is no limit or restriction on how much time you can spend underwater exploring or diving. Full definition
Often the remainder of the day offers unlimited diving on spectacular dive sites. (flyandsea.com)
Only Sandals includes unlimited diving with the best in equipment, staff and unbelievable dive sites. (sandals.com)
Diving packages are inclusive of 3 guided boat dives per day (except on arrival and departure days) and unlimited diving at the resort's house reef. (sipadan.com)