A big correction is imminent - What could Trigger ?

Updated
Sensex chart - 5 wave move is getting over. Ending diagonal is in the making. I can see the similarity of the 5th wave of the 5th, with the 5th of the 3rd - correction happened after an over throw (or a false breakout). The max i see is 69500.
After a 5 wave move the correction can be really deep. Minimum to 42000 levels if not deeper. What is going to trigger such a big correction
Note
Looks like 5th wave extension is happening... Need more analysis .. will update
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