Seems like the oxygen shell itself was just attached to the cockroach with adhesive, they were able to take it off afterwards.
> After experiments, the shell can be removed and the membrane can be gently polished off to minimise any restrictions on the cockroach’s normal behaviour and daily activities. Four small dorsal openings were reserved for attaching the oxygen tubes, which were connected to the thoracic spiracles.
> After experiments, the shell can be removed and the membrane can be gently polished off to minimise any restrictions on the cockroach’s normal behaviour and daily activities. Four small dorsal openings were reserved for attaching the oxygen tubes, which were connected to the thoracic spiracles.