Acoustic 15t Release Hook


The 15t Release Hook offers a new method of wirelessly separating an underwater load from its crane. By using acoustics, rather than divers or ROVs with cutting equipment, this method has the potential to both reduce risk and save time.

The Release Hook consists of a heavy duty strong back and lever system that amplifies the load capability of an Applied Acoustics’ 529P Release beacon, and a standard AAE surface control unit, typically a 3510 PAM Portable. Once the load is in position a remote acoustic signal received from the surface unit triggers the hinged hook to open, releasing the load, allowing the frame unit itself to be recovered in its entirety for reuse. Useful for bight release applications in the cable laying and repair industry, this acoustic Release Hook is also suited for coastal construction operations on wind farm sites, lowering work baskets or other subsea structures, separating lift bags from their loads or as a method of marking subsea infrastructures that are at risk of damage from surface activity.

Key features

  • 15 tonne release capability
  • Commanded by 3510 PAM or 2520 PAM, Easytrak Lite or Nexus USBL
  • Positive lever drive off with load assist release
  • Upgrade option for existing 529P beacons


  • Cable work operations
  • Crane and winch wire detachment
  • Submerged buoy recovery
  • Complementary to lift bag operations