How many survivors did Harriet Tubman lead Underground Railroad to escape slavery?

70 enslaved people.

Explanation:

Born into slavery, Tubman escaped and subsequently made some 13 missions to rescue approximately 70 enslaved people, including family and friends, using the network of antislavery activists and safe houses known as the Underground Railroad. During the American Civil War, she served as an armed scout and spy for the Union Army.

c it says nothing about connecting those 2 seas.