If for example the records could provide more information of the cargo. There first part is seal and agreement. the most logical place to work from is from Guernsey itself from St Peter port.. They had good port facilities and resupply. transit time to search area short, less fuel used.
However you business plan has to operate in stages. one you have find it to start with. the coast around Guernsey is littered with about 1700 shipwrecks. many are unknown. so the sea floor is going to be littered with debris.
How do you eat an elephant amigo? Bite by bite.
First you have to get data. its not some thing you can get over night. it takes time and money. This excludes most every day people as they have a need to pay their every day bills and expenses.
There is boat charter business there you could charter for season towing a marine mag detecting and logging targets in you search. in Summer and Autumn. Are at this stage you are just data collecting in the search suspected area. logging magnetic anomalies on sea floor. ( note ya going to find a lot of them. )
Depending on the depth of the search area.. This data gathering would take a few seasons progressively to find possible search sites. This is not easy. its time consuming.. then over time build er into more detailed profile analysis of sea for a detected target with underwater remote controlled system. with with we would be looking for clusters of cannons anchors etc pertaining to the 17th century.
Just because you find a cluster of cannons does not mean either you have located the right vessel either.
your search area we are assuming was with in site of Guernsey? if you are at the top of a 30-metre mast, you will be able to see up to 20 kilometers away. That's why there used to be a crow's nest so high up on the mast, for a lookout to announce that land had finally been sighted.
So realistically your looking around 20 km arc around the west of Guernsey. And that is just for starters.
Your search area is about 121 square kilometers.
Here is edge of the picture of bottom sediment.
60 meter 195 feet deep not so complex like deep water shipwreck. It sheer number of wrecks in the search zone that makes the search difficult. Also Recreational divers can dive as deep as 130 feet (40m). Although, this exact depth does not apply to all recreational divers as it all depends on the age and training of the divers. The maximum depth of a certified PADI Scuba Diver is 40ft (12m) and the maximum depth for a certified PADI Open Water Diver is 60ft.
So your in dangerous realm of deep water diving with limited bottom time. In short: most of the body can handle any pressure, but if we're breathing air the maximum safe depth is about 60 meters (190 feet), the feasible maximum with current technical capabilities (and special breathing gases) is about 500 meters (but, for safety reasons, those depths have only been simulated)
So a man diving on the site if discovered is out of the question. So then you face with fact you going to need a robotic rov able pick things off the floor and more suitable boat to that can handle such a vehicle and a rov with a superior battery life and a vessel able to cope with currents.
So nothing is easy? This is when you start burning the big bucks amigo.
So now you begin to see why no one has found it.? Time and money is a hard mistress to please.
Crow.
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