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Waitt Institute

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Contact

Sonar Data…

Contact 122 was detected by Mary Ann during Mission 061A on 18 & 19-Apr-09. It was upgraded to Target 5 after a detailed analysis.

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Contact 122/Target 5: 600m range - 75kHz frequency

Target2_600m_75khz-MAG.jpg

Contact 122/Target 5: 600m range - 75kHz frequency (magnified)

CONTACT REPORT

Contact Designation: #122

Assessment Criteria

1

2

3

4

5

Reflectivity: returned signal strength, relative and perceived

X

Overall dimensions: size

X

Overall geometry: shape

X

Associated bottom: debris field

X

Associated bottom: surrounding geology

X

Man-made versus natural: straight lines, perfect circles

X

Contact Location: Box 12C

Overall Rating: 4.2 / 5

Comments:
This target has very high relative reflectivity with no associated geology around it. It is not natural. It is approximately 18.8 meters long and 4.5 meters wide. The Electra’s wingspan is 16.8 meters and it is 11.8 meters long. The target is close in size but not quite wide enough as it is oriented on the sonar record. The image could be stretched like the 55 gallon drum. We do not anticipate definitive shape characteristics or definition at this range scale. This target shows promise even though it is smaller than expected. There are 2 additional small targets around 1700 meters to the North that could be associated debris.

See Re-Imaging…

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Re-Imaging

Re-Imaging Results…

Sonar

Target122_75m_410khzbox.jpg

Contact 122/Target 5: 75m range - 410kHz

Target122_75m_410khz-2mag.jpg

Contact 122/Target 5: 75m range - 140kHz frequency (magnified)

Photography

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Target 5 - Pipe 5,251 meters deep

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Target 5 - Pipe 5,251 meters deep

Comments:
The target turned out to be a pipe approximately 30 feet long and 12 inches in diameter sticking virtually straight up from the seafloor with a bend half way up. The image rang out incredibly well at range and was smaller than it initially appeared in the sonar record. This was, again, caused by the beam spreading and the contact was at the outer edge of the range. The roundness of the pipe also made it a very hard reflector and adjacent along track pings made it appear stretched or elongated. This tells us that even at the far ranges the sonar is putting a lot of energy in the water. Given the size of the Electra the sonar team believe we can safely say that it would have created a strong and noticeable return on the sonar record. The plane was not in the area we searched.

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