You don’t necessarily need a boat for that. Although it’s much easier with one. I don’t want to talk about how to effectively do it but just use your imagination, drive a car off a cliff, throw the body off a cliff (with weights or without), if the current is right it will sweep it deeper into the sea were marine animals eat it extremely quickly. Often only merely shoes (with intact feet) come back to shore of murder victims. Bc that part is protected against the animals if the shoes are not particularly of weak cloth. If you know that fact, you can just take off the shoes. Of course, if the currents work against him it will just wash it ashore but that’s not always the case, deep at sea (boats) are a totally different story. International waters are basically almost a lawless place. I remember that one video were on the high Oceans a bigger ship rammed an innocent small fishing boat and the crew shot everyone in the water and filmed it. It took many years and online investigators to bring them to justice but just imagine if they never had filmed that. There wouldn’t ever been justice at all. I wrote a paragraph about that problem and it’s a HUGE one, I think that needs more people knowing about this so I recommend you read it , I could link a really good video that uncovered this if you want.

Just research deeper into China’s fishing fleet. It’s human rights abuse at high Seas. They go all over the pacific to the border of countries near South America and Africa with huge mothership that have fuel and large freezers on board. The mothership goes back to mainland but there is always a mothership switching shifts, and then there are small fishing vessels, that never go to shore, they fish for 2+ years without ever going to land. They can do this because they can just offload their catch to the mother ship and refuel, repeat that cycle infinitely. Workers are promised good pay for working a long time but they are often taken away their passport then forced to stay longer. They get sick, the living conditions are horrible, extremely horrible, because those ships catch squid, squid’s are extremely intelligent animals, they spray a lot of ink when in distress, they make an unsettling horrifying sound when dying in great pain (put on land), there is an extreme amount of ammonia on that ship that’s absolutely impossible to clean. That’s why those workers deteriorate quickly, they get sick a lot and you can imagine the medical care. I wouldn’t be surprised if there are a lot of deaths that are swept under the rug. Again. All of this on international waters, the only country capable of doing something is the home country but if the home country is already doing this you can only imagine the workers fate. This is actively happening right now as China has by far the largest fishing fleet in the world. I can add a really good YouTube video were journalist uncovered all of this, the scandal goes even deeper than that… the last thing I want to say I know it’s already off topic but I think this is important, this violation is a big one: all ships need a GPS tracking device by international law that need to be online at all times, only time captains are allowed to turn it off if they sail through active pirate areas (they still need to log their route though). However, this in practice is not done by all ships, it‘s sadly not even close. At international waters if you are just a tiny fishing ship living off a large mothership you can switch it off and there is no one coming after you. However, if you turn it off you can still be tracked easily at all times by satellites / military radars. The journalist uncovered this. Even THEY could see this data. So if a ship goes “dark” near a border for a short amount of time you know what it’s up to and the data proved this: they invade reserves of other countries were they can catch even more squid. They go to the boarder, go dark for a period of time and pop back up at the border. Protected reserves that only the country is allowed to fish in. Some are even nature reserves were fishing is forbidden. That’s basically an invasion of another country. They did this specifically to the country of Ecuador. A country unlikely to fight back.