DIY underwater drone

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It's all about expectation and budget, I think it's very nice to share experiences trough these videos...

For the tether I considered the...

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redboat219 , thanks for sharing ... I like the channel of this guy, he's playing with several interesting water toys...
- weird to see that DC motors...

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TuptubBuilder, thanks for suggestion. bluerobotics.com looks very specialized place for my purpose.
At the moment I'm still evaluating the architecture...

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Thanks a lot for all comments.
I do not have any experience in RC world and that's for sure the biggest obstacle. On the other hand, I'm familiar...

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Is a drone controlled with a tether cable complicated to build?

Just wondering if I should start this DIY project instead to buy a 3k euro...