In 1969, a shrimp boat the M/V Mylark had been fitted with an expensive state of the art electronic detector in order to map the ocean floor in an area known as the Raspberry Straight, off the coast of Kodiak Island,
The experienced fisherman who were operating the equipment stated that what they picked up on the detector was not any known species of whale or any other indigenous marine creature from the region. What happened to the print out of the screen reading is unclear so it may no longer exist.
Dr. Roy P. Mackal theorised that there are still pods of ancient cetaceans in the world’s oceans known in the fossil record as Basilosaurus. He thought one may have been responsible for the strange reading .
There were often sceptics who claimed sonar readings in Loch Ness were the result of the sounds waves bouncing back from the loch sides. Not all readings can be attributed to this but some possibly could. Could the same thing have occurred here but with the waves bouncing back from the ocean floor ? I am no sonar expert so don’t know if it is possible .The other explanation is that it was a huge strange unknown creature, which is always a possibility.