Social media users were fascinated by one couple's unusual discovery when they went skating on a frozen lake in Alaska.

A hidden gem known for its crystal-clear, Caribbean-like waters ... Formed by the movement of a glacial ice sheet around ...

But there is a trick to make crystal-clear ice at home. Here's what you need to ... "It's similar to how a pond or lake freezes from the surface downwards." By freezing it slowly from the top ...