chén jìn zài tòng kǔ zhōng

be sunk (in misery)

The Chinese phrase '沉浸在痛苦中' conveys a deep emotional state where someone feels overwhelmed by suffering or despair. It is often used to describe a person who is so absorbed in their grief or unhappiness that they cannot see a way out, much like the metaphorical idea of being sunk beneath the water and unable to surface.