Now Playing: Trump says US prepared for Florence

Now Playing: Hurricane Florence threatens Myrtle Beach

Now Playing: Death toll rises as Tropical Storm Florence moves further inland

Now Playing: Tropical Storm Florence continues to flood roads and neighborhoods

Now Playing: Hundreds trapped as Florence floodwater rises

Now Playing: North Carolinians will not quit in the face of a challenge: NC governor

Now Playing: Residents should not return to homes until cleared by local officials: DHHS

Now Playing: At least 7 dead as Florence drenches Carolinas

Now Playing: 7 dead as Florence wreaks havoc on East Coast

Now Playing: Florence’s hidden floodwater dangers

Now Playing: Hundreds of Onslow County residents still in need of rescue

Now Playing: Rescues underway after massive storm surge ravages coastal town

Now Playing: Torrential rains spark fears of inland flooding

Now Playing: Tropical Storm Florence continues to slam South Carolina

Now Playing: Vulnerable pets rescued from the floods

Now Playing: More than 8,000 customers forced to leave homes after mysterious gas explosions

Now Playing: Hurricane Florence causes waist-deep flooding in North Carolina

Now Playing: Mother of MS-13 victim killed by car at daughter’s memorial

Now Playing: Residents rescued along with dog from Hurricane Florence flood waters

Now Playing: Today, convicted killer apologizes for shooting ex-girlfriend: Part 6