Hafmynd Ehf and Fugro Survey Pty Ltd, in a joint initiative with Woodside Energy Ltd, have successfully trialed a Gavia Offshore Surveyor AUV down to a subsea depth of 1000m. This significantly surpasses the previous maximum recorded depth of 220m achieved by a Gavia vehicle.
The Gavia AUV is a small, man-portable AUV, developed and manufactured in Iceland by Hafmynd. Its modular configuration enables the inclusion of various payloads in addition to the base vehicle configuration, such as an Inertial Navigation System, GeoSwath bathymetric sonar and additional battery modules for increased endurance.
The record-breaking dive to 1000m was part of a series of Customer Acceptance Trials recently completed offshore Perth, Western Australia. The AUV was set to run a grid of survey lines at an altitude of 12m above the seabed, recording both side scan sonar and swath bathymetric data.
This was followed by a survey line run at only 2m above the seabed, designed to collect seabed habitat photographs. Dive time from the surface to 1000m was approximately 30 minutes. Based on this expected survey duration at this depth could exceed 6 hours.
Overall, the Customer Acceptance Trials went very well and demonstrated once again that the Gavia AVU is a highly capable and versatile vehicle.