I believe this sci-fi anime was made in the 1990s.
The main character is a mute and lab experiment by some mad corporation. At the beginning, he escaped from his pod when they try to transport him via train. Also, he got some kind of worm living inside his head that gave him super power.
My memory is vague, but he did met up with a little girl and befriend her. The corporation tried to retrieve him and in the end, he end up destroying their headquarter. The ending shows him hibernating below the lake surface.
Anyone seen this anime and know the title?