Toggle for showing resources underwater

Currently, no resources are shown underwater when viewing resource deposits.
This proposal is to add a toggle for when viewing resources to "Show Underwater Resources" to make it more clear when/where resources are present underwater. I would recommend this being a toggle-able setting to avoid cluttering the map in the default view.

What is the reason behind this request?
As far as I know there are no default resources on official maps that are below water, beyond maybe stone, which isn't indicated anyway.
Is the request because you were digging near a body of water and accidentally flooded your mine?

There are some limestone deposits extending into the sea. Also, quite a lot of sand beaches extends well into the sea.

Amphibious excavators make this a more urgent request. Lots of people like to clear resource patches completely, and getting at the underwater portions is a pain. I was hoping the update would give us more visibility to what is underwater (both resources and terrain).