The CETO program aims to develop a military diving suit suitable for long-term deep-sea reconnaissance and infiltration. This model is designed specifically for underwater command and long-term covert operations. It uses a high concentration nutrient solution storage tank for enema and can support divers for up to six months of underwater activities with a single supply. The command type is equipped with a gain antenna for remote control of underwater drones and large-scale communication. The diving suit will dissolve the diver's arms to optimize fluid dynamics, relying entirely on the tail fin to achieve silent propulsion, making it difficult to be detected by enemy radar and sonar in deep-sea missions, providing excellent support for covert missions. At the same time, the suit can be equipped with the TORRENT underwater attitude control system to improve maneuverability and emergency rescue capabilities in non concealed states.

The diver's mouth and nasal cavity will be sealed by an underwater respirator, which inhales water through a gag to produce oxygen, and exhales exhaust gases and liquids through a nasal cannula. Due to the complete closure of the oral cavity, food cannot be ingested from the mouth cavity. The life support system can only be installed in the anus in the form of nutrient enema. The anus requires a permanent expander to fix the enema plug. The short battery storage tank can be used for 25 to 45 days under normal circumstances, and the low-power mode can last up to 60 days; Under normal circumstances, the long endurance can last for six months, but this type of liquid storage tank will occupy all the large intestine space of the mermaid. The mermaid diving suit requires divers to lie in a specially designed mold and inject nano latex for modification after completing the installation of the expander and tail amputation surgery. This liquid latex will completely cover the diver's body first, and after the latex solidifies, it will modify the diver's body structure. Suit will fuse their leg muscles and dissolve their arms to build their caudal fins, but the modification will retain the diver's knees to enhance their short distance mobility on land. If there is excess material in the arm, it will gather in the breast and a physiological monitoring device will be implanted from the nipple, which is fixed with a needle inside. Therefore, the position of the nipple will become very sensitive. Even if there is a transformation of pain and pleasure after the modification, the breast may still feel pain under tremendous external force. Due to their unique way of wearing, divers cannot put on or take off their diving suits on their own. In order to meet the requirements of quick response tasks, the members of the mermaid team will maintain their mermaid form for a long time after being sealed in rubber suits, but will not install computing cores or various tactical equipment, only retaining basic life support systems. Of course, they can occasionally take off their mouth ball respirators and enema anal plugs to enjoy a few normal meals to ensure their physical and mental health. However, such normal eating will not be assisted by others, so the girls can only lie by the pool to eat, like police dogs being raised. This may have some irreversible effects on the psychology of many latex mermaids, causing these mermaids to still want to maintain their armless body after retirement. Their fused legs can be squeezed to the lower body when twisted, and they can easily reach orgasm by squeezing their breasts. Some people even experience rejection reactions after recovering their original bodies. There are many cases like this, and they all choose to be transformed into armless latex mermaids. This completely restrained body has become their entire life, and they can still go home and enjoy retirement life after removing the implant expander and latex wrap around their head. In some extreme cases, latex mermaid girls have turned themselves into complete sex toys constantly using the equipment after retirement.