Location
Broken Rock lies in the southernmost corner of the Ari Atoll, on the
eastern side. The closest islands are Dhangethi to the north and Dhigurah
to the south. The thila, which seems to have been cleft asunder by a blow
from a giant axe, is some 70 metres (230 feet) in length, and rises to a
depth of some 13 metres (43 feet) beneath the surface. The remarkable
aspect of this coral base is the enormous canyon that runs diagonally
across the centre, from southeast to northwest. With a depth of 22 metres
(72 feet), this cleft was the source of the name, Broken Rock. On the
eastern side is a jutting formation with a remarkable shape, and another
small plateau, at a depth of 17 metres.
Dives
Aside from the considerable depth of the reef top, diving in this site
is fairly easy. There are several decisive factors in any decision
regarding the techniques to be used on this dive: the currents, which can
be very strong at times, but also the level of experience of the
participating divers. With weak currents, one can dive directly on to the
top of the reef. The most elegant technique, which is also the simplest in
the presence of powerful currents, is to dive at some distance from the
reef, in the open ocean, and then to swim in the reef with the current. It
is also possible to moor the boat on the reef itself, if it becomes
necessary to enter and emerge from the water by means of a line.
Life Forms
The dive site is embellished by a great many soft corals and by a
teeming and varied abundance of fish. Depending on how the current is
running, a scuba diver can always encounter different species. Unlike the
situation in other sites, the true, permanent inhabitants are few in
number.
There is however always the possibility of running into a grey reef shark
(Carcharhinus amblyrhynchos) or two, or a school of barracuda (Sphyraena
sp.). A mixed group of batfish (Platax teira) and blue fusiliers (Caesio
lunaris) are usually guests at Broken Rock, as are the many sea turtles (Eretmochelys
inbricata).
The jutting crags on the northeastern side are populated by a great many
tiny animals. One can, of course, gain an overall idea of the various
animals and corals by swimming all the way around the thila, which is
eminently possible if the currents are weak.
Safety
The plateau of Broken Rock lies at a depth of some 13 metres (43
feet).
This means that, when doing a drift-dive, the safety stop has to be made
in the open water with a parachute. If one moors the boat over the summit
of the reef, the dive should be planned so as to end near the boat.
Particular care should therefore be paid to the direction of the currents
and the air supply.
Respect for the Environment
As always, when drift-diving one must be careful to keep a greater
margin of distance from the corals. The risk of being swept away by
currents against a block of coral or against soft corals is, in fact,
greater than it would be in calmer waters. A number of parts of the canyon
and the coral base on the northeastern side invite the scuba diver to make
a closer examination. But truly tight passages should be avoided, because
there is a danger of harming the formations with one’s fins or other parts
of one’s diving equipment.
Photography
Broken Rock offers a great many opportunities both with lenses with
short depths of field, and with wide-angle lenses. Particularly handsome
underwater photography of seascapes can be done near the jutting crags in
the northeastern section. In the morning, the interplay of light can be
truly remarkable.
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A
motionless redmouth grouper (Aethaloperca rogaa) waits patiently while
a minuscule cleaner shrimp works to free its skin from parasites.

This scorpionfish (Scorpaenopsis sp.) gives another example of its
remarkable ability to blend in with the seabed.

Among the tentacles of a sea anemone, a Clark clownfish (Amphiprion
clarkii) peeks out timidly.

As
if they were swimming in formation, perfectly synchronized in their
movements and their turns, bluestriped snappers (Lutjanus kasmira) are
a constant presence along the reef walls.

Similar to an intricate welter of arms, these sponge formations grow
upward toward the ocean surface.
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