Since he would be using his Batman identity a few more times in the coming days, Luke had already prepared all sorts of escape routes.
The ocean was the simplest and most practical one.
He wasn't someone who relied just on his physical strength to survive. He had already set up a counter-surveillance route in the ocean.
He could still use this trick to escape once or twice more before this method was found out.
At that time, Batman would probably go into hibernation, and would only come out when necessary.
While he could have fewer of other things, he couldn't have fewer aliases.
Generally speaking, a superhero's identity represented his beliefs and strength. However, he had many abilities, and they would only continue to accumulate.
He only had one goal in mind: to earn experience and credit points.
Whether in terms of sentiment or feasibility, the cost and difficulty of replacing an alias were very low.