That's called a boat, and they have none of the dangers of actual submarines. And the analogy to metaphorical submarines applies as well: https://news.ycombinat

That's called a boat, and they have none of the dangers of actual submarines. And the analogy to metaphorical submarines applies as well: https://news.ycombinator.com/item?id=26358647 https://news.ycombinator.com/item?id=26358647