自沉

自沉	zì chén	to scuttle (a ship) / to drown oneself
自	zì	(bound form) self; oneself / from; since / naturally; as a matter of course
沉	chén	variant of 沉
沉	chén	to submerge / to immerse / to sink / to keep down / to lower / to drop / deep / profound / heavy