The free MP4 for this map is available for download below.
Platinum, Diamond, And Adamantium tier Patrons also have access to the Foundry-compatible WEBM format of over 20 animated maps, including this one. They can download this map here: dww-underwater-reef-animated.webm
The Foundry content archive can be found here (as well as all the animated maps in WebM format):
This item was published by someone else on Patreon. The link at the bottom will take you to the post.