Do other countries have anything similar to BUDS (Navy Seal training)?
This is one of the excersizes, it's named Drown Proof Testing, "The trainees’ arms and legs are bound as they jump into the pool. They must bob in the water for five minutes, and then they must float in the water for five minutes followed by a 100 meter swim. Another two minute bob and then a series of front and backwards flips. After this the trainee must swim to the bottom of the pool and retrieve an object with their teeth and bring it back up to the surface where they once again have to bob for another five minutes."
This isn't part of the "hell week" either, which is considered the worst part of it. Not to mention the training takes six months, as opposed to 12 weeks (for the marines which have longest boot camp)
The Drown Proof testing has also had a fair amount of deaths, around 7 in the past 5 years, but it's relatively rare to die. As instructors try their hardest to prevent it.
However, the fail rate for Navy Seal training is ~78% (for men)