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Esa profundidad es peligrosa para el submarino.

Esa profundidad es peligrosa para el submarino.
That depth is dangerous for the submarine.
From Lesson 224:Initial causes (como)·Spanish (Latin America)

Questions & Answers about Esa profundidad es peligrosa para el submarino.

Why do we use para instead of por in this sentence?
We use para here because it indicates the recipient or the entity affected by the danger (the submarine). A helpful trick is that peligroso para translates directly to 'dangerous for' when talking about who or what is at risk. You would use por if you were talking about the cause of a danger.
Why is it Esa profundidad and not Eso profundidad?
Esa is a demonstrative adjective meaning 'that,' and it must match the noun it modifies in gender and number. Since profundidad is feminine and singular, we use Esa. Eso is a neutral pronoun used only when referring to a general concept, unnamed situation, or unknown object, and it is never placed directly in front of a noun.
How do I know that profundidad is a feminine noun?
In Spanish, almost all nouns ending in the suffix -dad (like profundidad, universidad, and verdad) are feminine. Because it is feminine, all describing words must match it, which is why the sentence uses Esa and peligrosa.
Could we use está instead of es here since a submarine is only at that depth temporarily?
No, you must use es (from the verb ser). Even though the submarine's location is temporary, being dangerous is an inherent characteristic of that specific depth. Ser is used for characteristics and qualities, while estar is used for conditions or states.

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