You weren’t paying attention then, you really think he literally showed up uninvited? They contacted him in the first place, after he had been asked on Twitter to get involved he initially replied that they probably had it under control:
He then spitballed some ideas with other Twitter users, there was obviously enough visibility on that thread that led to someone in the Thai government putting him in touch with the head of the dive team. He repeatedly double checked with that guy, Stanton, that his help was needed, got the sub designed, tested and sent out in just a few days.
By the time they got over there though the rescue team were already implementing the main rescue effort, and things were going easier than planned. It might still have been required if the situation took a turn for the worse, but luckily everything went smoothly. Everyone except Unsworth seemed appreciative though, and the Thai SEALs even asked to hang onto the sub for future use.
