1. The first American submarine, Turtle, attempted to sink a British ship in Charleston Harbor on October 30, 1775. Although the attempt was unsuccessful, it marked a significant advance in naval warfare technology.

2. The Robert Mills-designed Hibernian Society Hall in Charleston was dedicated on October 30, 1840. The building was a center for Charleston's Irish immigrants and continues to be used as an event space.

3. The University of South Carolina was founded on October 30, 1801, as South Carolina College. It is the state's flagship university and has a rich history of academic achievement and innovation.

4. On October 30, 1864, Confederate troops under General William Hardee unsuccessfully attempted to halt Union General William T. Sherman's march through Georgia and the Carolinas. The Battle of Honey Hill, fought near Grahamville, resulted in significant casualties on both sides.

5. In 1975, the first Confederate submarine, H.L. Hunley, was raised from its resting place off the coast of Charleston after 136 years underwater. The submarine had been used in an attack on the Union ship Housatonic in February 1864, becoming the first submarine to successfully sink an enemy ship. However, the Hunley also sank and all eight crew members perished. The submarine is now on display at the Warren Lasch Conservation Center in North Charleston.