Teraport Cages are used to punch through Teraport Area Denial systems, by using shielding that damps out the denial field. However, energy emissions still leak out, and usually only a few teraports can be attempted before the cage is detected and the TAD is ramped up enough to overpower the shielding. Teraporting under heavy TAD is not only dangerous, but is also likely to burn out the cage, even if successful.