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The tense of the second line is off (浮遊していた), but other than that it's fine. I was wondering about the "star cluster" translation (seems like a rather large-scale word to use for a colony), but after searching for it, I found that it is in fact correct.
イシス歴元年 means "the first year of the Isis calender." They established a new calendar, and named it イシス歴 the Isis calender.
cf.
グレゴリオ暦
the Gregorian calendar
ユリウス暦
the Julian calendar
整備されていった。整備されていた。
The main problem is "that" in "small rivers that flowed into large waterways".
大きな水路となり doesn't modify 小川, as I wrote, so 小川は大きな水路となり just means "small rivers became/flowed into large waterways, and..."
I think it's just "creature troops".Is クリーチャー部隊 the name of the group, or just a description?
消息不明: Untraceable/Their information is unknown.Here (and below) I translated 消息不明 as "affiliation unknown", I'm really not sure if it's the best way to translate it though.
Are you confusing 消息(しょうそく) with 所属(しょぞく), by any chance?
イシス星団、地球との交信を完全に断つ is an active sentence: it's Isis which cuts off contact. If you translate it passively ("communication is cut off"), this detail is lost.
Go back and read the original intro.
イシス星団 refers to the collection of colonies─in other words, a location.
The colonies (which have presumably been taken over by the mutants, though no one can say for sure because all the survey teams are getting slaughtered─or worse─before they can report back) cut off all contact with Earth.
It's not really all that strange or confusing.