How is suspense created in the film 'What lies beneath' ?

There are many ways in which the film ' What lies beneath' creates suspense for example . When Clarie is looking through the window with a pair of binoculars and is spying on her neighbor and one minute he is there and the next minute hes not. This makes both Claire and the audience pondering on his whereabouts. However ,the next time we look he is there. This results in both the audience and Clarie are shocked. The build up of suspense and tension is made by the use of silence and the use of dark ominous tones.

another example would be ;

when the claire picked up the phone to doublecheck if her husband had called 911 to confess about his previous fellonys , when in actual matter of fact instead he had diled 441 . when she learns this she is baffeld and so are the audiance. whilst she was checking the phone she was standing infront of a bathroom mirror and all of a sudden her husband apperes in the mirror behind her and tries to suffocate her with a peice of cloth that we interpte to have some kind of chemiacal on it. After the struggle we see claires whole body becoming weaker and weaker as she tries to escape the wrath of her pscotic husband.