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They are both passive voice. They areBut the verb form of to have must match a new tomb and so it must be a new tomb has been discovered. As G Tony Jacobs has pointed out, '*a new tomb have been discovered' is ungrammatical.

Otherwise, they are both correct. Both of them have a passive subject (a new tomb), a passive verb conjugation (has been discovered) and a "by clause" which shows the actors of the sentence. A "by clause" is not necessary in a passive sentence. In your examples the "by clause" signify different things. In #1 you have "by archaeologists". That is all we know about the actors. They could be archeologists on the moon using an extremely long range sensing device, for all we know. But the new tomb is "in Egypt." In #2 the "by clause" is further modified by "archeologists in Egypt". Now the actors are "archeologists in Egypt" but we can't take it for granted that the new tomb is in Egypt.

They are both passive voice. They are both correct. Both of them have a passive subject (a new tomb), a passive verb conjugation (has been discovered) and a "by clause" which shows the actors of the sentence. A "by clause" is not necessary in a passive sentence. In your examples the "by clause" signify different things. In #1 you have "by archaeologists". That is all we know about the actors. They could be archeologists on the moon using an extremely long range sensing device, for all we know. But the new tomb is "in Egypt." In #2 the "by clause" is further modified by "archeologists in Egypt". Now the actors are "archeologists in Egypt" but we can't take it for granted that the new tomb is in Egypt.

They are both passive voice. But the verb form of to have must match a new tomb and so it must be a new tomb has been discovered. As G Tony Jacobs has pointed out, '*a new tomb have been discovered' is ungrammatical.

Otherwise, they are both correct. Both of them have a passive subject (a new tomb), a passive verb conjugation (has been discovered) and a "by clause" which shows the actors of the sentence. A "by clause" is not necessary in a passive sentence. In your examples the "by clause" signify different things. In #1 you have "by archaeologists". That is all we know about the actors. They could be archeologists on the moon using an extremely long range sensing device, for all we know. But the new tomb is "in Egypt." In #2 the "by clause" is further modified by "archeologists in Egypt". Now the actors are "archeologists in Egypt" but we can't take it for granted that the new tomb is in Egypt.

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They are both passive voice. They are both correct. Both of them have a passive subject (a new tomb), a passive verb conjugation (has been discovered) and a "by clause" which shows the actors of the sentence. A "by clause" is not necessary in a passive sentence. In your examples the "by clause" signify different things. In #1 you have "by archaeologists". That is all we know about the actors. They could be archeologists on the moon using an extremely long range sensing device, for all we know. But the new tomb is "in Egypt." In #2 the "by clause" is further modified by "archeologists in Egypt". Now the actors are "archeologists in Egypt" but we can't take it for granted that the new tomb is in Egypt.