Sounds like you're being Koi (Nelson/Marlborough) Traditional Geocache
Trigger_Fish: A diving mate that helped me place this checked on it today and has reported that it is missing.
Sounds like you're being Koi (Nelson/Marlborough)
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Difficulty:
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Terrain:
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Size: 
(small)
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You need to go SCUBA Diving in order to retrieve this cache.
The Koi was built in Scotland in 1906, it was a twin screw steamer of 53 net register tons and shipped to New Zealand in sections, where she was assembled and launched the same year.
She was used as a passengers ferry in and around the Motueka area and was re-floated and lengthened by another 4 meters after being swamped at the entrance to Nelson Harbour in 1910.
In 1930 she was converted to a coal hulk and as such sank at her moorings in Picton on the 10th of March 1940, after which she was eventually scuttled on the 5th of May 1940.
The wreck (and therefore the cache, as it is hidden on the wreck) is in 12 meters of water.
The cache is a yellow plastic dive torch container with notebook and pencil, attached to a dive weight. To log the cache you need to dive at the listed co-ordinates and search for the container (ideally using proper underwater search techniques), which has been dropped at these co-ordinates from the surface.
Retrieve the cache, log it and then drop it back at the listed co-ordinates.
The cache may be difficult to find. That's just the nature of underwater searches.
Additional Hints
(Decrypt)
Lbh arrq gb tb FPHON Qvivat va beqre gb ergevrir guvf pnpur.