2 incidents?

After reading blogs and studying the blast door map for years now, how come the incident it mentions happens in 1985 and not 1977 like in the finale "the Incident".. It wouldn't take Dharma 7 years to in-case the area and tunnels in concrete (ie, the H bomb, just like Sayid said in his Chernobyl explanation) as i would have assumed it would be a major flaw knowing there is a bomb where you wanna build a station. I know everyone is banging on about changing the future and that we will have to wait and see but i need logical explanation now god dammit and give me back my kidney too!

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