久溺深海冷不冷久溺深心痛不痛
[jiŭ nì shēn hăi lĕng bù lĕng jiŭ nì shēn xīn tòng bù tòng]
The Coldness and Sorrow of Immersing too Deep either in Sea or in Feelings describes extreme emotional immersion akin to being submerged underwater for a very long period - coldly distant but warmly heartfelt at once; feeling intense loneliness and sorrow that is difficult to describe.