Hard swimming without warming up?

I have a Tri relay coming up that I do every year and I typically warm up maybe 600-1000 yds and then it is usually at least 30-45 minutes of standing around before the wave goes off. My question is, does a warm up last 30-45 minutes even though the pulse is at rest? I've heard of coaches who have asked their swimmers to go hard without warm up. Of course in a pool I don't have time to warm up and then sit for 30 minutes, so is going hard without a warmup of any kind a training technique with benefit, or should it be avoided due to injury or potential heart attack?
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