I was one of a group of Just Stop Oil activists given the longest-ever UK sentences for peaceful motorway. Six months into my incarceration, this is what I have learned
Not directly related to climate change, but Just Stop Oil has been in the news a lot.
I think it would also depend on the speed one could drill holes with an underwater drill, as opposed to cutting them with some other tool (like an underwater sawzall, if such a thing exists), or making them with another method entirely. After all, it’s not just an issue of battery life, it’s an issue of finishing quickly so as not to get caught or give the crew time to stop/repair the damage.
Maybe a battery powered hammer and a 6" nail? Probably a lot faster, though more holes would be needed.
Need more info to make this math happen…