Pompeii would remain buried....

[Carlsoak]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #879 "Pompeii, past and present", question 3

After the disaster, Pompeii would remain buried under a layer of ash more than seven meters deep, all ......... of the residents existence would lie undiscovered for over 200 years.

(a) correspondence
(b) substantiation
(c) fortitude
(d) adventures

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #879 "Pompeii, past and present", answer 3

After the disaster, Pompeii would remain buried under a layer of ash more than seven meters deep, all substantiation of the residents existence would lie undiscovered for over 200 years.

Correct answer: (b) substantiation
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After the disaster, Pompeii would remain buried under a layer of ash more than seven meters deep

what sense does "would" make" in this context ?
after the disaster Pomp. has been remained buried under.... even in some sectors til yet

[Mister Micawber]

Future in the past:

Tomorrow I will go dancing.
He had a birthday party on January 28th, 1948, and the next day he would go dancing.
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Native English teacher at Mister Micawber's