My users would like to be able to see the ocean contour lines as they zoom in. But mapbox outdoors style only seems to provide contours for land.
I'm not a GIS pro but a web dev, so please keep that in mind in any answers. I do have experience in publishing my own tilesets to mapbox with points, shapes, and labels. But a tileset with all of the contours for the entire water area of the earth sounds impractical and very large for me to host on my little portion of mapbox. But I don't see that they have such a layers available.