[This video was shot with full consent of the model. The model was assured that she can pause or terminate the shooting and be released from any risky circumstances at any moment, by using predefined signals including but not limited to safe-words and safe-moves. WARNING: The video features performance by either professionals or under the supervision of professionals. Do not attempt to recreate any actions similar to the ones that appear in this video. No solo breathplay. NEVER.] This video features another spectacular underwater performance by Xiaoyu-senpai, with assistance from Xiaomeng. The footage is recorded by a fixed camera above water and a handheld camera for both above and underwater shots. The video begins with the breathtaking vacuum bag compression session. Xiaoyu is placed into a vacuum bag, air is removed, and she is then slowly submerged. Initially, we still used a vacuum cleaner to extract the air, but quickly discovered that under water pressure, even a small amount of residual air in the bag would be ruthlessly squeezed to the top, making this compression method far more efficient than a vacuum cleaner. Consequently, for subsequent attempts, we directly used water pressure for compression, achieving unexpectedly perfect results. The water enveloped Xiaoyu’s body, meticulously expelling every bit of air from the bag. Each ripple of the water tightened the bag more intimately around her curves, as if completely isolating her from the outside world. Xiaoyu’s comment about this experience was: “I am in the water, yet I am not in the water…” Next is underwater breathholding. Xiaoyu’s legs are held down by Xiaomeng at the edge of the pool, while her body lies submerged. If Xiaoyu needs to breathe, she must contract her abdomen and rise to bring her head above water. If she wishes to rest and relax by lying flat, she must hold her breath underwater. This dilemma makes her to choose between physical exertion and the need for air. However, Xiaoyu’s breathholding ability and core strength are both exceptionally powerful, making this challenge seem relatively easy for her. With each rise, even when accompanied by gasps for air, a glint of triumph from overcoming the challenge seems to sparkle in her eyes. Finally, we opted for a more aggressive approach: a collar and chain. Xiaomeng pulls the chain, submerging Xiaoyu and compelling her to hold her breath for extended periods. Being unable to decide for herself when she can surface to breathe undoubtedly brings an unprecedented level of tension and immense psychological pressure to Xiaoyu. She must fully trust Xiaomeng on the other end of the chain, surrendering complete control over her right to breathe. However, Xiaomeng is quite gentle; after a few rounds, I took over from Xiaomeng. Under my control, even when Xiaoyu was allowed to surface, she was given only a single breath, or even half a breath, barely enough for adequate ventilation. Under such high-intensity, extreme pressure, Xiaoyu ultimately couldn’t sustain it, struggling, and coughing violently—a clear testament to her reaching her limit.