Visible crew/equipment: In the first plane scene, you see the toy plane take off, if you look at the first shot of it coming off the ground, you can see a shadow of a person and the headphones with the mic over the mouth. (00:06:05)
Visible crew/equipment: In the shot of Michael Douglas pouring a drink at the back of the plane, you can see the boom mike overhead.
Chosen answer: Designs of torpedoes dating back to before World War Two were generally capable of exceeding thirty knots, with many current designs easily doubling that and, in certain cases, reaching well into three-figure territory. The Juliet-class torpedo appears to be fictional, but, given the performance figures for real life designs, a speed of thirty knots seems actually quite slow.
Tailkinker