left,  bursts from compressed air guns trailed by the vessel set off acoustic pulses used in gathering siesmic data.

below,  Onboard computers enable scientists to analyze geophysical data as it is gathered.

Gulf Orange Disc, Winter, 1982 .....
The Hedberg underwent a major re-fitting in Vancouver BC.  During that process, the bow section, which had been cut off to facilitate addition of the new 60 foot long mid-section, sank while being fitted.  This accident caused a several month delay in completion of the re-fitting.


Photo to the left, and below right are after the re-fitting.  Below left was taken in 1974, shortly after leaving Vancouver BC.