What do scuba diver down flags look like?

Answer 1

There are two types of "Diver Down" flags: the well known US version and an international version.

The US version is a rectangular red flag with a single, wide white stripe running diagonally from the top left corner to bottom right corner.

The international "Diver Down" flag is blue and white. It has a vertical white strip with two blue swallow tails. This flag is International Flag Code A (pronounced phonetically as 'alfa' or 'alpha'.) When flown as part of a message, this flag represents the character "A". When this flag is flown independently, it takes on the meaning of the "Diver Down" flag.

Both flags are intended to send the following message to other vessels: "I have a diver down. Keep well clear at slow speed." Check the links for images and specifications.

Answer 2

Like the image above. Red flag with white diagonal stripe.