Ah, so they’re not permanent! I always assumed they were. Similarly, you’ll see occasional Liquid Nitrogen tanks around: https://youtu.be/juZqGU9iuq0 https://

Ah, so they’re not permanent! I always assumed they were. Similarly, you’ll see occasional Liquid Nitrogen tanks around: https://youtu.be/juZqGU9iuq0 https://youtu.be/juZqGU9iuq0