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Quote: Fixing cracked wooden floor boards

We have two areas of our kitchen/dining area where our floor boards have started cracking - please refer to the photos. One area is covered with the most beautiful (LOL) duct tape so we don't accidentally stand on in; the second area you can see more clearly. The cracks haven't gone right through the boards yet, so I was hoping there was a way to reinforce them from under the floor. The only problem is, the crawl space is extremely tight and I'd be very surprised if you could get to the second area. I'm really after ideas and quotes on how this could be fixed. I'd like to avoid having to re-sand and re-polish the floors.