Isla Grosa Marine Park Dive Sites. (North East of La Manga strip)
This Big island in front of Thomas Mastre port offers some protected & shallow boat dives & is best dived at the south of the island where there is an entrance to a cave that extends around 80 meters inside the island & is a maximum depth of 7 metres & is good for most qualified divers. You can also dive the east side that has a maximum depth of 21 meters.
The East of the Islas Grosa island lies the strange rock of El Farallon which is around 10 minutes boat ride from Thomas Maestro port. This gentle sloping site reaches a depth of 18 metres as you swim through the scattered clusters of rocks that make shelter for a large variety of fish. There are also fields of oceanic posidonia or neptune grass, which bring large shoals of goldline fish which feed on this ,plus a whole variety of other types of fish.
Which means flag is just north east of El Farallon & a shallow dive site with lots of artifacts due to the sinking of a ship from the Venetian times. The wreck has just recently been dug out & on show in the maritime museum with lots of pieces of pottery , spear heads & other artifacts can be found still. Depth ranges from 3 meters to 22 meters & there is a canyon you can swim through at around 12 metres. This site is good for recently qualified divers and advanced and is surronded by posidonia or neptune grass.
Is a shallow reef just 300 metres from La laja at 19 to 24 metres deep.
There are a variety of other dive sites stretching westwards towards Cartagena & as far as Mazarron that have been discovered & include a cave dive.