[dfwgator]

The Kursk immediately comes to mind.

[arrogantsob]

My boy was assigned to the USS Ohio at that time and I was very upset that the disaster happened. And watching the futile efforts which would have been extremely difficult for us, if possible at all, was frustrating.

Geo-political issues aside, humanity trumps them on occasion.

[sparklite2]

The Kursk immediately comes to mind.

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As does the Thresher.