What does « To reach / Bottom » mean in the Quran?

Wherever you may be, death will overtake you, even if you should be within towers of lofty construction. But if good comes to them, they say, "This is from Allah "; and if evil befalls them, they say, "This is from you." Say, "All [things] are from Allah." So what is [the matter] with those people that they can hardly understand any statement?

And whoever emigrates for the cause of Allah will find on the earth many [alternative] locations and abundance. And whoever leaves his home as an emigrant to Allah and His Messenger and then death overtakes him - his reward has already become incumbent upon Allah. And Allah is ever Forgiving and Merciful.

Indeed, the hypocrites will be in the lowest depths of the Fire - and never will you find for them a helper -

Vision perceives Him not, but He perceives [all] vision; and He is the Subtle, the Acquainted.

[Allah] will say, "Enter among nations which had passed on before you of jinn and mankind into the Fire." Every time a nation enters, it will curse its sister until, when they have all overtaken one another therein, the last of them will say about the first of them "Our Lord, these had misled us, so give them a double punishment of the Fire. He will say, "For each is double, but you do not know."