versinken
to sink
To go completely under in a liquid or a soft mass and no longer be visible.
Das Schiff traf einen Eisberg und versank innerhalb weniger Stunden im Meer.
The ship hit an iceberg and sank in the sea within a few hours.

to sink
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to sink
To go completely under in a liquid or a soft mass and no longer be visible.
Das Schiff traf einen Eisberg und versank innerhalb weniger Stunden im Meer.
The ship hit an iceberg and sank in the sea within a few hours.

'Versinken' (to sink) is an inseparable verb. The prefix 'ver-' always remains attached to the stem 'sinken' (to sink). It intensifies the meaning and emphasizes that something goes under or disappears completely.
Das Auto ist im Schlamm versunken.
The car sank into the mud.
Since 'versinken' (to sink) describes a change of state or a movement, the perfect tense is always formed with the auxiliary verb 'sein' (to be). So the correct form is 'ist versunken' (has sunk / is absorbed).
Die Sonne ist bereits im Meer versunken.
The sun has already sunk into the sea.
When someone becomes mentally or emotionally absorbed in something, 'versinken' is always used with the preposition 'in' and the dative. This structure is very typical.
Er versank tief in Gedanken und bemerkte mich nicht.
He sank deep into thought and didn't notice me.
In the meaning of 'going under in a negative state', 'versinken' (to sink into) is often combined with abstract nouns like 'Chaos' (chaos), 'Armut' (poverty), 'Trauer' (grief), or 'Schulden' (debt).
Nach der Firmenpleite drohte er in Schulden zu versinken.
After the company went bankrupt, he threatened to sink into debt.
The use of 'versinken' (to sink) for celestial bodies like the sun is poetic. In normal usage, you would more likely say 'untergehen' (to set), but in literary or romantic contexts, 'versinken' is common.
Wir beobachteten, wie der Mond langsam hinter den Bergen versank.
We watched as the moon slowly sank behind the mountains.
to sink / fall
'sinken' and 'versinken' can both mean that something goes downward and gets under a surface. 'sinken' mainly describes the downward movement. 'versinken' emphasizes the result more strongly: something goes completely under, disappears in water, mud, or a soft mass, and is often no longer visible. In addition, 'versinken in' is also used figuratively when someone is completely caught up in thoughts, work, or grief. The words can be confused because both describe going under. If only the downward movement is important, 'sinken' fits. If going completely under or becoming lost in something is important, 'versinken' fits.

Nach dem Regen versank der Schuh tief im Schlamm.
After the rain, the shoe sank deep into the mud.
Das Papierboot sank langsam im Wasser.
The paper boat slowly sank in the water.