A huge, hidden laboratory. There is only one way in or out, and it reacts only to Makuro's reiatsu signature. This is where Makuro conducts all of his most secret experiments. The laboratory leaks absolutely no reiatsu, and contains its own Senkaimon, which allows it access to the human world. It also has an experimental Garganta, which allows Makuro to travel to Hueco Mundo freely. These gates are only one way, currently. They can, however, stay open for a specified amount of time. They will reopen once they sense Makuro's reiatsu signature.
((This thread doubles as a training thread))