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Contact

Sonar data…

Mary Ann detected these two discrete contacts during Mission 020A in box 20A with her sonars set on 120kHz with a 600 meter range. Both contacts presented as vertical lines in the right channel on the original survey.  After the initial analysis they were designated Target 3 because of their proximity.

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Contact 42: 600m range - 120kHz frequency

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Contact 42: 600m range - 120kHz frequency (magnified)

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Contact 43: 600m range - 120kHz frequency

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Contact 43: 600m range - 120kHz frequency (Magnified)

CONTACT REPORT

Contact Designation: #43

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 20A

Overall Rating: 3.8 / 5

Comments:
There are two targets that are approximately 2.5km apart. Both have a high reflectivity and have no associated geology. Size of target #42 is overall 10m in length and only 2m wide, however a small shadow is associated with it. Target #43 is 8m by 5m with a small additional target in its vicinity. Both of these targets are in a very benign bottom area and stand out as non-natural and do not fit in with their surroundings. This is their strongest characteristic. While target #42 does not match general shape expectations and/or overall dimensions its proximity to #42 make it efficient to re-image. Target #43 has similarities to the replica target that was imaged during the sea-trial. The overall ranking is for target #43.

See Re-Imaging…

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Re-Imaging

Re-Imaging Results…

Sonar

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Target 3 (Contact 42): 75m range - 410kHz frequency

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Target 3 (Contact 42): 75m range - 410kHz frequency (magnified)

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Target 3 (Contact 43): 75m range - 410kHz frequency

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Contact 43/Target 3: 75m range - 410kHz frequency (magnified)

Photography

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Target 3 (Contact 42) Chain or Metal Pipe 5,283 meters deep

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Target 3 (Contact 42) Chain or Metal Pipe 5,283 meters deep

Comments:

Both targets were re-imaged on sonar and a photo image was captured of contact #42, unfortunately contact #43 was in a gap in the photos shot and could not be positively identified through that media. With the imagery collected with the high frequency sonar #43 appears to be a pipe sticking out of the seafloor. Both of these targets are most likely from a passing ship throwing unwanted scrap over the side. Target #42 appears to be some sort of metal chain or linkage. It is consistent with the sonar record. The sonar imagery for #42 was recorded while the vehicle was turning. This made the image appear curvy and longer than it actually was.

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