Table:
text: Operation Flintlock (nuclear test)
Operation Flintlock (nuclear test)
United States' Flintlock series tests and detonations
Name_ Location_ Elevation_Height Delivery Purpose Yield
Moa - 1 (with Screamer) NTS Area U3ed metres (ft) + 0 Underground shaft Weapons development 2.5 kt
Screamer - 2 (with Moa) NTS Area U3dg metres (ft) - metres (ft) Underground shaft Weapon effect 9 kt
Elkhart NTS Area U9bs metres (ft) - metres (ft) Underground shaft Weapons development 6 kt
Long Shot Amichitka Island, Alaska metres (ft) - metres (ft) Underground shaft Joint verification 80 kt
Sepia NTS Area U3en metres (ft) - metres (ft) Underground shaft Weapons development 7 kt
Kermet NTS Area U2c metres (ft) - metres (ft) Underground shaft Weapons development 500 t
Corduroy NTS Area U10k metres (ft) - metres (ft) Underground shaft Weapons development 120 kt

Question: What is the purpose of Long Shot under Operation Flintlock (nuclear test)?