Back in my law office days, we had a Chinese client who tried to swim to Taiwan. He got lost and was caught and jailed. When he got out, he tried again at night, and this time he navigated by the stars and made it to Taiwan, which is how he made it to America and became our client. Remarkable man, but not unusual.
China to Taiwan is about 100 miles. That’s quite a swim. I’d call it unusual.