Radio Controlled Lego Submarine

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The discussion focuses on a radio-controlled Lego submarine build, highlighting the challenges of radio control in water. The builder salvaged a toy radio controller operating at 27MHz, as higher frequencies are ineffective underwater. The submarine achieved a control range of 3 to 4 meters, with limited improvements from adjusting antenna and receiver placements. Additionally, the project involved Python coding for a Raspberry Pi and utilized a syringe mechanism for ballast control. The associated blog provides further details on the build process.
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Youtuber builds a cool radio controlled submarine
 
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He also has an associated blog describing the build in greater detail.

https://brickexperimentchannel.wordpress.com/rc-submarine-4-0-blog-post-series/

In particular, I was curious about the radio-controlled aspect as radio-control is pretty much impossible in water. He salvaged a toy radio controller with a low-frequency transmission of 27MHz citing that very issue ie GHz wouldn't work at all.

His build was able to control the submarine at a maximum of 3 to 4 meters. Playing with antenna placement and receiver placement didn't seem to improve it all that much.

Another part of his build was the python coding for a Raspberry-Pi and the use of a syringe to control ballast.
 

Thread 'Can you get pulled under a train?'

Assume that a 100m long (probably irrelevant) train travelling at 30m/s, with a mass of 100.000 Kg passes next to a man/woman of 100 Kg standing still at 1 m away from the track. Since air is massively displaced by the train, creating like a small vacuum/low pressure area next to its surface, I reckon a certain pull may be applied to anything the train passes by, so in this case a person. My question is very simple: this pull can be quantified by a force. Is this force enough to pull the...
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