Erakles Epitrapeze - Lysippos
A UUV found by Indonesian fishermen on December 20 was a Chinese made Sea Wing glider. The design is broadly similar to other variable-buoyancy propelled gliders. The cutaway is based on inferring the internal layout from photographs of the exterior and general knowledge of other gliders.
https://www.navalnews.com/naval-news/2020/12/chinese-submarine-drone-discovered-near-gateway-to-indian-ocean/