Tulamben is on the northeast coast, just north of Mt. Agung, Bali's largest volcano. It's about a three hour drive from Denpasar and main tourism an hotel areas in the south of Bali - 3-1/2 hours if you're coming from Nusa Dua. Some people do Tulamben as a day trip, but that's too much driving for too little diving AFAIC - I'd recommend staying at one of the dive resorts at Tulamben for at least 2-3 days.
The main attraction for most divers is the Liberty Wreck, a WWII freighter (not a Liberty ship) which was beached after receiving a torpedo. When Mt. Agung erupted in 1962 (?), local earthquakes resulted in rolling the hulk into the water, where it now sits on its starboard side just off the rock beach, deck facing deep water.
The Liberty Wreck is a shore dive. Think of it as a biodiversity dive rather than as a wreck dive. The highest parts of the wreck, formerly port side, are very near surface, while deepest area of the wreck (near bow) is only 30 m. The surrounding area is mainly black volcanic silt. The wreck is covered with interesting soft corals and other inverts, and there is a vibrant and varied population of fishes, all very accustomed to divers, so photo ops are many and varied.
Macro subjects commonly seen include frogfishes, ornate ghost pipefish, thorny seahorses, jawfishes. Visibility is often only so-so, but there are nice wide-angle possibilities on the wreck (which is breaking down nicely, very 3-D), including subjects such as a resident school of jacks (big-eye trevallies), very large potato cods (groupers), Napoleon wrasse, and lots of triggerfishes (titan, clown), surgeonfishes, etc.
You will probably have seen a lot of the same macro subjects at Wakatobi, but then again who can ever get tired of these wonderful critters? I do very much enjoy shooting wide-angle on this wreck, particularly on morning dives, which sometimes offer better visibility.
The "drop-off" - a nice wall on a rocky point not far from the Tulamben wreck, used to be a great dive, but was badly damaged by silt during river flood in early 2003. This site is coming back, but still not what it once was. You can arrange for a jukung (local craft) to take you around the point to some nice coral sites a bit further away that were not affected by the flooding.
Other dive areas in the Tulamben area which can easily be reached (by vehicle) while staying there are Amed (to the east) and Kubu (a couple of miles west).
The three best known places to stay at Tulamben are the Mimpi (upscale accomodations, particularly good if you're travelling with non-diving spouse), Paradise (the original, basic but inexpensive and perfectly adequate accomodations) and Tauch Terminal (German run, nice rooms, caters mainly to European clientele. All are a reasonable walk from the Liberty wreck. It's mandatory to allow porters to carry your gear - this provides major source of income to residents of the local village. Mimpi and Paradise will cooperate with outside operators, Tauch Terminal does not.
I've stayed at all three, but nowadays usually stay at the Paradise (to keep costs down), and arrange dives in the area through a local Sanur-based operator. Contact me by email at
rdelfs@tabula-international.com
if you'd like specific recommendations.
If you're going to be in Bali between now and the end of September, I would also urge you to consider Nusa Penida for mola mola. It's one of the best places in the world to see them. Also a good manta site, though not always accessible, and some excellent drifts. Currents can be tricky, so I think it's important to dive with someone who knows the area.
Menjangan (on northwest coast) is also nice. There's a nice wall, and an interesting sandy point, also an older wreck at about 40 m. This is more conventional indo-pacific reef diving, but what's wrong with that? Secret Bay, a very nice (and famous) macro site, is also accessible while staying in the Menjangan area.
Frogfish
If