Sounds like the starter solenoid has been submerged and the water inside it has produced rust or corrosion that has stopped it from closing the starter contacts properly. You could try to clean it and perhaps get it working again but it may be easier to put a rebuilt starter in to address this problem. You may have other issues if it was in water that deep so be prepared if this does not produce a running vehicle again.
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Wait, you are not the original poster, do you have the same issue as the original poster plus the symptom of the starter clicking but not engaging?
Sounds like the starter solenoid has been submerged and the water inside it has produced rust or corrosion that has stopped it from closing the starter contacts properly. You could try to clean it and perhaps get it working again but it may be easier to put a rebuilt starter in to address this problem. You may have other issues if it was in water that deep so be prepared if this does not produce a running vehicle again.