Although the Hunley survived the attack , she foundered and sank while returning from her mission , thus ending the threat to the Union blockade .
Hunley made a daring night attack on the USS Housatonic .
Although the Hunley survived the attack , Hunley foundered and sank while returning from Hunley 's mission , thus ending the threat to the Union blockade .
Hunley made a daring night attack on the USS Housatonic .