The ring fell into the sewer. What should we do? First of all, we need to keep calm, don't panic, and don't try to dig the sewer with anything, otherwise it may further sink the ring deeper and increase the difficulty of taking it out.

Here are some common ways to help us get the ring back from the sewer:

1. Use the vacuum cleaner: put the vacuum cleaner near the sewer, aim the suction nozzle at the ring position, turn on the vacuum cleaner and suck the ring. Keep the power low when turning on the vacuum cleaner to avoid the ring being sucked deeper.

2. Hook: Use a small hook to gently pick up the ring in the sewer and pull it out. This requires skill and accuracy, but it is the most common solution.

3. With the help of tools: We can use some special tools, such as a mud ring or something as soft as rubber, to stop the water in the sewer, so that we can easily find and retrieve this ring.

4. Remove the manhole cover: If all the above methods fail, we can try to remove the manhole cover, which requires some tools and skills. If we are not sure, we can ask professionals to help us.

5. Seek professional help: If we can't get the ring back, we can seek professional help, such as a sewer cleaning company or a jewelry store to find and get it back. Don't choose blind methods, otherwise it will increase the difficulty of handling or make the ring go deeper into the sewer.

Most importantly, try to avoid taking jewelry to the place where the sewer needs to be cleaned, so as not to lose it.