unterwasser
underwater
Located or taking place below the surface of the water.
Die Unterwasser-Aufnahmen des Dokumentarfilms waren atemberaubend.
The documentary film's underwater shots were breathtaking.

underwater
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underwater
Located or taking place below the surface of the water.
Die Unterwasser-Aufnahmen des Dokumentarfilms waren atemberaubend.
The documentary film's underwater shots were breathtaking.

The word is a simple compound made from the preposition 'unter' (under) and the noun 'Wasser' (water). Its meaning is therefore literally 'located under the water'.
Die Unterwasser-Expedition entdeckte neue Tierarten.
The underwater expedition discovered new animal species.
'Unterwasser' (underwater) is often used as an adverb to describe where an action takes place. In this function, it is written in lowercase and usually comes after the verb.
Der Taucher konnte fünf Minuten unterwasser bleiben.
The diver was able to stay underwater for five minutes.
The word element 'Unterwasser-' (underwater) is very productive and forms many compound nouns. Typical examples are 'die Unterwasserkamera' (underwater camera), 'die Unterwasserwelt' (underwater world), or 'die Unterwasserarchäologie' (underwater archaeology).
Er kaufte sich eine spezielle Unterwasserkamera für den Urlaub.
He bought himself a special underwater camera for the vacation.