277.4m deep cave diving record in Asia
At 2:10am, 27th April, 2023, PSAI China IT Han Ting (Greco), surface after a 12.5 hours deep cave dive and achieved a new Asia deep cave diving record to 277.4m in GuangXi, China.
Ting used two Liberty SM CCR for the dive together with the 3rd unit station at 50m for standby on the way up. His last deco was finished at 10m depth in a habitat fixed 2 weeks before. An O2/Neon mix also used as the final deco gas.
The dive is a part of the on-going project (DJCF - Duan’s Jiudun Cave Features) to explore this cave which it's bottom is still not yet to be reach.
Below is from HAN Ting after his dive:
“Yesterday, I took on a new challenge at Jiudun and eventually reached a turning point at 277 meters, breaking the Asian record.
In previous attempts, I went south-north for deep diving, but this time I tried diving both up and down in the northern cave. The descent was slower and more winding, making the situation more complicated. From the 40-meter cave entrance, I had to swim through a 20-meter horizontal passage to reach the 50-meter vertical well entrance. The 50-120 meter vertical well passage was quite narrow, followed by a slope from 120-170 meters until reaching the vertical well below 170 meters. Additionally, some slight ear equalization problem caused some delay. The planned depth was between 270-290 meters, with an alert time of 15 minutes set for turning back and a mandatory decompression plan of no more than 12 hours. When I reached over 270 meters, I felt very good, and HPNS did not show any obvious effect. When the Alert sounded, I hesitated for a second, as I knew I could break the world record by just one more minute. However, I was pleased that I resisted the temptation, stopped the descent according to plan, tied knots, marked the arrow, and ascended. The later decompression was perfectly in line with the plan. There will be more opportunities in the future.
I tried many new methods this time, such as setting up a decompression habitat in advance at 10 meters, which was very useful. During the 12-and-a-half-hour dive, I spent five hours in the tent eating and drinking comfortably.
I also made significant adjustments to the decompression plan, using neon as a replacement for inert gas to accelerate decompression. The results were very significant, as I felt better both physically and mentally after the dive. I am grateful for the professional guidance from DHS and the on-site medical support. We used ultrasound to check for bubbles in the decompression habitat. Additionally, I did an extreme test for the Huawei ULTIMATE sport watch, take it down to 123 meters and hanging it on a node during the descent and carrying it throughout the return journey. The depth was not a problem, and the battery was very powerful, with over 20% remaining after 12 and a half hours.
Summary: Technology can help explorers break through limits and explore extreme environments more safely and efficiently.
Finally, thanks to the 'underwater support team' @John @Edi @King @kiki, and the 'surface and land support team' @Director Song @Chung Siu @Violet @Director Zhao and photographer, as well as all the friends who provided equipment support! “
亞洲洞穴深潛新記錄 - 277.4米
2023年4月27日凌晨2:10分，PSAI中国的IT韩頲 (老猫)在完成了长达12.5个小时的大深度洞穴潜水后，在广西都安九顿天窗顺利升水，并创造了277.4米的亚洲洞穴潜水的深度纪录。
韩頲在此次潜水中携带了两台Liberty侧挂CCR，并且在50米深度预布了第三台用为上升阶段可能需要的备用CCR。他最后的减压在10米深度，于两周前安装的减压帐篷内完成，在最后的减压阶段中并用到了氧/氖混合气体作为减压气体。
此次潜水是九顿天窗探索项目的一部分，其洞穴底部至今尚未探明。
以下是韩頲在潜水后发表的简短说明：
“ 昨天又在九顿做了次新的挑战，最终到达277米折返，再刷了次亚洲纪录。
之前几次下深都是南下北上，这次尝试了上下都在北洞，下潜会蜿蜒一点慢一点，情况比较复杂，从40米洞口需经20米横向通道游到50米的直井洞口，50-120米的直井通道较狭窄，120-170米是斜坡，170以下才到直井，加上耳压不是太顺也耽误了些时间。计划的深度是270-290米，预备折返的时间Alert设的15分钟，强制减压计划不超过12个小时。到两百七十多米的时候状态很好，HPNS没有明显的影响，ALERT响的时候犹豫了一秒：只需要多一分钟就可以破世界纪录。很高兴抵住了诱惑，按计划停止下潜、打结、放箭头标、上升。后期减压完美契合计划。来日方长。
这次尝试了很多新方法，比如预先在10米搭建了减压帐篷，非常好用。12个半小时的潜水，后期有5个小时在帐篷里好吃好喝地渡过。
减压方案也做了很大的调整，使用氖气作为替换惰性气体来加速减压，小白鼠表示效果非常显著。减完上水，身体和精神状态都明显好于以往。感谢潜伺DHS的专业指导，以及现场提供的医疗保障，在减压帐篷里就用超声做气泡检测了。
另外值得一提的是顺便帮华为ULTIMATE做了次极限测试，下潜到123米时挂在节点上，返回时再全程带着。深度没问题，电池也很给力，12个半小时后还有百分之二十多的余电。"
总结：科技会帮助探险者更安全、更高效地突破极限与探索极境。
最后感谢潜水支援的@小马@Edi@敬@kiki特地赶来水陆支援的@宋导@钟少@Violet@赵导和摄影师，以及提供设备支持的各位朋友！
Before The Dive
Final Check
Jiu Dun Cave Map
At 277m
Computer 1
Computer 2
Habitat 1
Habitat 2
Body Check
On the Way Up
Just Surfaced
Support Team
Team
