Under Siege is a 1992action film, in which a band of terrorists captures a warship with nuclear weapons, and threaten the world with armageddon. The only thing in their way is a ship's cook. Who just happens to be a retiring former U.S. Navy seal with special-weapons and hand-to-hand combat training.
... "mat" (me) and "stha" (standing, staying at) and
means "they are in me".
"-aham" (I) in the second line is nominative. na caaham =
"...and not I....", meaning "but I ...