The next series of drawings are based on a hypothetical scenario : if anti-capitalist activists wanted to hurt the super-rich by sinking their super-yachts, how could they achieve that goal ?
Sabotaging a boat inside a harbor is risky and requires specialized diving skills and equipment (see the Rainbow Warrior affair) so an attack at sea is easier to organize. But super-yachts can be as large as frigates so a large charge under the waterline is needed, like a heavyweight torpedo...

Wire-powered electric torpedoes are not new, as illustrated by the Sims-Edison torpedo of 1889 [1], but placing the power generation and guidance systems on the boat simplifies the design and construction of the torpedo. A single-wire transmission scheme with earth (or seawater) return is relatively easy to build by amateurs [2] and has several advantages : by increasing the voltage, the current decreases so the wire can be thinner and longer for a given spool drum.

[1] https://archive.hnsa.org/doc/jolie/.....t1.htm#page013
[2] https://simplifier.neocities.org/singlewire.html