Michael McFadyen's Scuba Diving Web Site
Home Contact Me Sydney Reef Dive Sites Sydney Shipwrecks NSW Dive Sites Australian Dive Sites Overseas Dive Sites Dive Accidents and Incidents My Yachting Adventures 4WD Trips Weather Search 18 May 2024 16:08

About Me
My Diving
Web Links - Dive Clubs
St George Scuba Club
Some of my Best Photos
Contact Me

Dive Sites
Sydney Reef Dive Sites
Sydney Shipwrecks
Sydney Dive Visibility, Swell and Temps
Kelly Talking on ABC Sydney about Shipwrecks
NSW Dive Sites
Sydney Shipwreck Summary
NSW Shipwreck GPS/Marks
Australian Dive Sites
Overseas Dive Sites
Aircraft I have Dived
Old Bottles
Free Shipwreck Books

Dive Related Equipment
Shearwater Predator and Heinrichs Weikamp OSTC 2N
Uwatec Aladin Dive Computers
Apollo AV1 Underwater Scooter
Bauer Compressor
DIY Oxygen Stick - Nitrox
GoPro HD Hero Video Camera
My Camera Setup
Purchase of New Dive Boat
My Dive Boat - Mak Cat
My Old Dive Boat - Le Scat
My Dive Gear
GPS and Diving
Make Your Own Car Tank Rack

Marine Life
Rarer Sydney Marine Life
Bare Island Pygmy Pipe Horses
Bare Island Sea Horses
Bare Island Nudibranchs
Bare Island Marine Life
Encounter with Southern Right Whale and Calf

Other Dive Info
How Weather Affects Diving in Sydney
Visibility and Wave Averages in Sydney
Waves and Diving
Diving Weather and Sea Conditions
Tide Tables
Dive Accidents and Incidents
Dive Book Reviews
Site Map
Noel Hitchins 1951-2005
Lloyd Bridges - Mike Nelson in Sea Hunt
My Yachting Adventures
Below is a list of links to the main pages about my yacht, Catlypso and My Yachting Adventures:
  • Purchase of Catlypso
  • Details about Catlypso
  • Cleaning/Repairing Catlypso
  • My Yachting Adventures.
  • Login


    Forgotten your password?
    Request a new one here.
    Michael's 4WD Trips
    Click here for a list of my Four Wheel Drive and Camping Trips.
    Home Brewing
    Click here for an article about Home Brewing.
    Sydney Dive Site Hints
    "Red Indianfish seem to prefer northern sides of the entrances to bays and harbours"
    Batu Bolong, Indonesia
    Michael McFadyen's Scuba Diving - Batu Bolong, Indonesia

    In September 2012 Kelly and I did a week long liveaboard dive trip in Indonesia which went from Bali to Komodo and back. We went on the MV Mermaid II. Click here to read about the boat. This is one of the dive sites we did on the trip. The trip heads north-east from Benoa Harbour on Bali out north of Lombok and then north of the other islands to Komodo Island and then down the eastern side of Komodo to the southernmost point of Komodo. For all dives on this trip we used 31% Nitrox, so bear this in mind when considering the bottom times we did.

    Batu Bolong is a smallish rock that comes up from 40+ metres and is located towards the northern end of Linta Strait, the waterway that runs between Komodo and Rinja (Rinca) Islands. An approximate GPS mark for the dive spot is 8° 32' 17.5"S 119° 36' 38.4"E (using WGS84 as the datum). The site is east-north-east from the GPS mark.

    Satellite Photo
    A satellite photo from Google Earth that shows the location of the dive site

    Batu Bolong is out in the middle of the strait and is affected to an extent by currents. Accordingly, the side you dive will be determined by the current. The southern side is dived when the current is from the north and the northern side when the current is from the south.

    Dive Site Map
    A map of the dive site - north is at the bottom of the map
    Used courtesy of Mermaid Cruises

    As with virtually all dive sites that you do when on MV Mermaid II, you use the RIB (rigid inflatable boat) to get to the start of the dive (and also to get back to the boat). The RIB will drop you normally about 20 metres off the rock.

    As the current was from the north, we were dropped on the southern side. Once in the water, we dropped to 22 metres on a rock and coral slope. The bottom slopes very steeply, almost vertically on the eastern and western sides, to the depths.

    Barrel spongeRed gorgonia
    One of the many large barrel spongesRed gorgonias are all over the place
    ReefWhite gorgonia
    Kelly on a very colourful
    section of the reef
    White gorgonia on the wall

    The slope has lots of small gorgonias and small barrel sponges. It is very colourful, with bright sponges and other marine life really making this one of the most attractive dive sites I have ever done.

    We work our way around the rock towards the eastern side, dropping to about 30 metres as we go. Once on the eastern side we find the current a bit too strong to make it easy to go past here, so we turn around and go back towards the west. We see a number of turtles in this area, including one that is eating sponges.

    There are some huge hump-headed wrasse at this site and a white-tipped reef shark swims by us. There are many firefish (lionfish) and we see a couple more turtles. At the western side we again strike the current. We have gradually ascended to about 16 metres, so we turn and again head east.

    TurtleKelly and Turtle
    A turtleKelly videoing another turtle

    This is repeated till we are back at the western side again. Here there are hundreds of small fish eating at something on the rocks. A close examination reveals that they are eating the millions of sergeant major eggs that have been laid on the rocks. A few sergeant majors are trying to defend their offspring without any success. Such is life (as Ned Kelly once said)!

    Back towards the south we see two huge moray eels, one the biggest I have ever seen. It is truly enormous but will not come out enough for me to take its photograph. We end the dive in about five metres, spending more than 15 minutes here before we ascended.

    Kelly and pufferTurtle and shark
    Kelly and starry pufferfish A white-tipped reef shark and a turtle

    After our ascent, we have to wait a while to be picked up as most of the other divers from our boat have ascended at the same time. We stick together and the current swirls and takes us in a large circle away from the rock and back again before we head off to the south. We are finally collected a few hundred metres south of the rock.

    This was an really great dive site, perhaps with the most colourful bottom I have ever seen. The visibility was 30 metres and the water temperature was about 27°C.

    Click here to return to the list of sites we did on our MV Mermaid II trip.

    Copyright © Michael McFadyen 1990 to 2024
    Non-commercial use of an article or photograph is permitted with appropriate URL reference to this site.
    Dive shops, dive operators, publications and government departments cannot use anything without first seeking and receiving approval from Michael McFadyen.
    This web site has been wholly thought up, designed, constructed and funded for almost 30 years by Michael McFadyen without any help from the Australian Dive Industry.
    Website created 1996!