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I built an ROV to solve missing person cases

suanto.com

131–140 of 167 posts

Re: I built an ROV to solve missing person cases

#131
post #2

As you can see, this is long: https://suanto.com/2024/06/06/the-time-I-built-an-ROV-02/ https://suanto.com/2024/06/06/the-time-I-built-an-ROV-03/ https://suanto.com/2024/06/06/the-time-I-built-an-ROV-04/ https://suanto.com/2024/06/06/the-time-I-built-an-ROV-05/ https://suanto.com/2024/06/06/the-time-I-built-an-ROV-06/ https://suanto.com/2024/06/06/the-time-I-built-an-ROV-07/ https://suanto.com/2024/06/06/the-time-I-b…

TFA is nothing short of amazing and absolutely deserves attention. The author (and his brother) built (from scratch!) a side-scan sonar remote controlled boat and an ROV (a remote controlled submersible) with a camera and a light, and with this they found TWO missing persons' cars under water. Real products of these sorts would have cost enormous amounts of money, but they built their own for the cost of parts and la…

Yeah, this was a good read and definitely the kind of material I come to HN to read.

Re: I built an ROV to solve missing person cases

#132
post #22

> So where was he going? I saw two possibilities: either to Tikkakoski to visit his ex-girlfrind he was on the phone with or; just to drive around with a new powerful car, to shake off the heated phone call. I don't understand how suicide isn't at the top of the list here. He was obviously very upset emotionally. He didn't care for his belongs other than his phone. He didn't care to steal someone's car or answer for…

Why would he bring his phone though?

Re: I built an ROV to solve missing person cases

#133
post #109

This is amazing. A Finnish man gets curious about a missing persons case. He does some great detective work, and builds an ROV with side scanning sonar and video. The outcome, with some help from his brother, is just spectacular. I couldn't stop reading!

It's absolutely brilliant. Everyone has watched a TV show where a case is slowly being solved, but who actually considers that oh yeah, I could actually become the person who searches for a random missing person case, instead of watching it on Netflix? And the amount of McGyvering involved! How many people would have given up at one of the steps? Oh it requires coding in C++ for Arduino, sure, I'll just do that. Oh,…

I'm surprised someone hasn't made a miniseries out of this yet. It'd make a good one.

Re: I built an ROV to solve missing person cases

#134

The article doesn't say so, but some web search and deepl.com translation makes it sound like the second missing person may have died by suicide. When they first found the sunken car, they wondered (presuming that the car had gone off the road by accident) how the heck the car had ended up so far out into the water. The answer might be that it didn't fall off the road, but rather was driven off at high speed on purpo…

I liked how they used logic to narrow things down to just what was verifiable and only ended up searching a few spots in the end. It makes me feel like the police should work with them to solve other missing persons cases.

Re: I built an ROV to solve missing person cases

#135
post #5

I love these long-form build logs. I just started reading, and I am making the faux-pas of commenting before finishing. But, I'm wondering what the challenges are of automating the ROV to map a body of water's floor in a pattern. like a grid pattern, or whatever is most efficient. At first I was thinking currents would cause displacement. but can't we sense the current moving us in undesirable ways and correct with t…

Note that ROV stands for Remotely Operated Vehicle - it is not autonomous, it is controlled by a person.

What you are describing would be called a UUV (unmanned underwater vehicle) or AUV (autonomous underwater vehicle).

Re: I built an ROV to solve missing person cases

#136
post #127

The author clearly reads HN or used to. I’m curious if he plans on pursuing this further. Sounds like the last investigation wrapped in 2021 and he may have even gotten a cash injection to upgrade some of his kit. The last update kind of leaves you hanging!

If the author wants to crowdsource the funding of the next operation (if needed) this story would be an amazing push. I sure would donate to solving more cases!

Re: I built an ROV to solve missing person cases

#137
post #22

> So where was he going? I saw two possibilities: either to Tikkakoski to visit his ex-girlfrind he was on the phone with or; just to drive around with a new powerful car, to shake off the heated phone call. I don't understand how suicide isn't at the top of the list here. He was obviously very upset emotionally. He didn't care for his belongs other than his phone. He didn't care to steal someone's car or answer for…

Why would he bring his phone though?

Mine lives in my pocket. I pretty much bring it everywhere I go.

Re: I built an ROV to solve missing person cases

#138
post #22

> So where was he going? I saw two possibilities: either to Tikkakoski to visit his ex-girlfrind he was on the phone with or; just to drive around with a new powerful car, to shake off the heated phone call. I don't understand how suicide isn't at the top of the list here. He was obviously very upset emotionally. He didn't care for his belongs other than his phone. He didn't care to steal someone's car or answer for…

Why would he bring his phone though?

To send last messages before he kills himself? Call for help if he backs out?

Re: I built an ROV to solve missing person cases

#139

This is amazing. A Finnish man gets curious about a missing persons case. He does some great detective work, and builds an ROV with side scanning sonar and video. The outcome, with some help from his brother, is just spectacular. I couldn't stop reading!

This is giving post-scarcity civilization vibes...

Re: I built an ROV to solve missing person cases

#140
post #134

The article doesn't say so, but some web search and deepl.com translation makes it sound like the second missing person may have died by suicide. When they first found the sunken car, they wondered (presuming that the car had gone off the road by accident) how the heck the car had ended up so far out into the water. The answer might be that it didn't fall off the road, but rather was driven off at high speed on purpo…

I liked how they used logic to narrow things down to just what was verifiable and only ended up searching a few spots in the end. It makes me feel like the police should work with them to solve other missing persons cases.

Yeah it's first principles reasoning, just like coding and manufacturing lol!
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