Questions & Answers about Нам некого здесь спасать: ни людей, ни животных.
Why do we use the Dative case (нам) at the start of this sentence?
In Russian, to express "there is nothing/no one for [someone] to [do]", you use the Dative case for the person, followed by a не-pronoun (like некого or нечего) and an infinitive. Here, нам means "for us".
What is the difference between некого and никого, and why is некого used here?
Use некого (stressed on the first syllable) when there is an infinitive (спасать) but no conjugated verb. It conveys "there is no one to [save]". If you used a normal conjugated verb, you would need double negation with никого + не (for example, Мы никого здесь не спасаем — We are not saving anyone here).
The current lesson is about ни + Genitive. Are людей and животных in the Genitive case here?
Technically, they are in the Accusative case to match некого, because they are the direct objects of спасать (to save). However, because they refer to living things, their plural Accusative forms are identical to the Genitive (the "Animate Accusative" rule). Furthermore, strong negation with ни frequently forces the Genitive case anyway, making this form perfectly overlap with the lesson's core concept.
Why isn't there a не or нет next to the ни ..., ни ... phrase?