There's a race against time to save five dolphins trapped inside a hole in the ice in Canada. They've been swimming in circles for four days now, and the space they're in is getting smaller and smaller.
The dolphins have to keep coming to the surface of the water to breathe, and so far attempts to free them have only scared them. Even so the mayor of the town where the dolphins are trapped has asked for a special ship to smash up the ice.
Some people are worried that using an "icebreaker" could harm the dolphins, but time is running out for the animals. Because it's very cold in Canada the water could get even icier, and eventually the hole could disappear.