High Dependency Unit (HDU) are a Dunedin noise-rock trio formed in 1994 by Tristan Dingemans (guitar/vocals), Neil Phillips (bass/guitar), and Constantine “Dino” Karlis (drums, percussion, synth, samples). All three grew up in Hawke’s Bay before relocating to Dunedin in the early 1990s, initially playing together in Eskimo Chain. The band crystallised when Phillips experimented with running his bass through two guitar amplifiers — the moment Karlis recalls as the instant they knew they had something. Intent on being “the heaviest band in the world, while still kind of doing the indie thing we loved,” they took cues from the outer fringes of rock, jazz, and an unexpected source: Dunedin’s early rave scene. Dingemans attended Entrain raves in 1992, and Karlis would later identify direct parallels between their guitar walls and both Pink Floyd and Goa trance.
Two of their earliest fans at those first shows — supporting Age of Dog at the Empire Tavern in May 1994 — were Natasha Griffiths and Dale Cotton. Cotton, who drummed for Age of Dog, became HDU’s “fourth member” as their sound engineer, recording their debut cassette at Broken Ear Studio and producing the Flying Nun EP Abstinence: Acrimony (1995) and debut album Sum of the Few (1996). Griffiths, who was managing Age of Dog and in a relationship with Cotton at the time, later took a job at Flying Nun Records and arranged an industry showcase — a gig at Squid with My Deviant Daughter — that resulted in the label signing them on the spot. “HDU wouldn’t have achieved anything without Natasha,” Dingemans has said. “She knew what she was doing.”
I instantly knew we had something. This is what we were trying to do.
Constantine “Dino” Karlis, AudioCulture
In 1997, Cotton returned with engineer Nick Abbott at Tailgater Studios to produce the Higher EP — now considered a touchstone of their catalogue. Its companion release Higher ++ (1998) was a full remix album that put the electronic connections on full display: Soundproof‘s shimmering rework of “Lull” became the best-known track, a sweeping epic that revealed how naturally their dense guitar music translated into electronica. That same year, HDU contributed a live recording of “Point That Thing Somewhere Else” — performed with Dunedin legend Peter Gutteridge at the Powerstation in Auckland — to God Save The Clean (FNCD409), Flying Nun’s 1998 tribute album to The Clean, a compilation that also featured electronic-leaning artists alongside the label’s guitar acts.
Following the Memento Mori EP (2000), HDU toured the United States supporting Shellac, then spent two weeks recording at Steve Albini’s Electrical Audio studio in Chicago — sessions sent to Albini by Flying Nun after hearing Sum of the Few. The resulting Fire Works (2001) drew acclaim for its stripped-back ferocity. After a quiet period, the band returned with Metamathics (2008) on Shoot The Freak Records, widely considered their most uncompromising studio record and the closest approximation of their devastating live sound. BBC presenter John Peel, who had championed the band on his programme after hearing Sum of the Few, described them as “one of the 10 best bands in the world you’ve never heard of.”
HDU wouldn’t have achieved anything without Natasha. I mean, we would have done okay, but she knew what she was doing.
Tristan Dingemans, AudioCulture
The band reunited in 2011 to help Flying Nun celebrate their 30th anniversary, and again for the Laneway Festival in 2016. In 2025, Higher received its first vinyl pressing via Haymaker Records, accompanied by a national tour including a double-headline Wellington show with Zamrock pioneers W.I.T.C.H. Outside of HDU, Dingemans performs solo as Kāhu and with the cinematic trio Kāhu Rōpū (with Sam Healey and Rob Falconer) and Mountaineater. Karlis has played drums in Dimmer and formed the droney, improv-based Great Barrier with Jason Kerr and Foundling.
Live: Flying Nun 30th Birthday, ARA, 2011
Bandcamp
Members
- Tristan Dingemans (guitar/vocals, Eskimo Chain, Kāhu, Kāhu Rōpū, Mountaineater)
- Constantine Karlis (drums/percussion/synth/samples, Eskimo Chain, Dimmer, Great Barrier, Foundling)
- Neil Phillips (bass/guitar, Eskimo Chain)
Discography
- High Dependency Unit EP (1994, self-released)
- Abstinence:Acrimony EP (1995, Flying Nun Records, FNCD 348)
- Sum Of The Few LP (1996, Flying Nun Records, FN381)
- Higher EP (1997, Flying Nun Records, FNCD 407)
- Higher ++ LP (1998, Flying Nun Records, FNCD410)
- Crosschannel Multitap LP (1998, Flying Nun Records, FNCD414)
- Memento Mori EP (2000, Flying Nun Records, FNCD430)
- Fire Works LP (2001, Flying Nun Records, FNCD450)
- Tunguska Single (2006, Furtherist, FUR001)
- Stupormodel / Blue Skies Split (2007, Shoot The Freak Records, STF001) with Die! Die! Die!
- Metamathics LP (2008, Shoot The Freak Records, STF002)
- Higher EP (2025, Haymaker Records) reissue