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10,000 autonomous ships to do it in 9yrs?

with what funding for that many ships for what purpose of recovering the investment?

Sometimes purpose isn't about money. Though funding would be an issue.

Could I know your formula?

ocean : 361,000,000(km2)

6knots: 11.1km/h

361,000,000/(24*365) = 41,096(km2/day)

41,096/11.1 = 3,702

so, 100 ships take 37years?

Thank you, klaus23!

I'll throw my result into the ring. I get 37 years:

Did it ever occur to you that you take a square kilometer as a linear kilometer in your calculation?

Don’t the ships have a kilometre wide sonar scan? Therefore traveling 1 kilometre counts as scanning 1 kilometre squared.

to what depth?