For many years, the only acoustic release systems available for deep-sea missions were either stainless steel heavy-duty 1000kg release load or aluminium shallow water 30 kg release load. There was nothing available in between.

Which is why KUMO developed KUMQuat. It is a lightweight, deep-sea, corrosion resistant, acoustically controlled releaser that can not only be used with KUMO equipment but also by developers in the wider global market.

KUMQuat comes in two versions – lightweight and heavy load. Both can be used either in-line (inside of a rope, wire, chain), where buoyancy is attached to the rope above and weights are attached to a rope below (conventional mooring), or as a part of an instrument where the ground weight is attached below (OBS or lander). Both are entirely built from titanium and are certified to operate at depths of up to 10,000 m depending on customer requirements.

The release mechanism is controlled either via an external acoustic signal or through an integrated timer. Furthermore, KUMQuat offers the advantage of three additional output lines. When combined with an input line this allows for the remote control or status check of other instruments via its acoustic receiver.


  • In-line mooring release
  • Weight release for subsea instruments
  • Control of other instruments via acoustic receiver

Features / Benefits:

  • Robust corrosion-free titanium build
  • External acoustic remote control
  • Optimised to work with PACS & 8011M deck boxes
  • User command input available
Models Lightweight (K/MT 562 and K/MT 573 (in-line)) and Heavy Load (K/MT 552 and K/MT 572 (in-line))
Release load Lightweight – 250 kg, Heavy load – 1000 kg
Safe working load Lightweight – 500 kg, Heavy load – 2500 kg
Reply frequencies  7.5 – 15 kHz (0.5 kHz increment)Standard: 12 kHz
Reply pulse width 8.5 ms – 17 ms
Command coding  FSK 16 bit, 12,000 individual codes available 
Commands  Release, Range ON, Range OFF, Three individual I/O commands
Input / Output capabilities  3 x external device controller1 x input line for external device checks
Power supply 2 x 6 Alkaline C-cells (baby)
Battery life 24 months (with 1.9 times safety), 100 x releases, 3000 x pings
Quiescent power  270 μA typical
Quiescent power consumption 2.5 mW typical
Material Titanium
Operational depth Up to 10,000 m
Dimensions Diameter – 110 mm, Length – 625 mm 
Weight Lightweight – 11.1kg (air) / 6.3kg (water), Heavy Load – 13.6kg (air) / 7.7kg (water)