MAC LiquidLast Eyeliner
Keyword: IT STAYS!
You think there's no real waterproof eyeliner which can be intense and also stay more than a few hours? I thought the same and tried so many...until I found the Liquidlast from MAC.
The eyeliner that really lasts in extreme conditions - in a sauna, in tropical heat or tropical rain, in salted ocean or pool water, from the morning until the next day. Without having to worry that it faded, or that it smudged, you don't have to reapply it, just enjoy the day knowing that your perfect line looks exactly as you saw it in the morning when you applied it.
Comes in many shades too!
The removing part will be a bit tricky - you need an oil based make up remove.
In case you wonder, No, the other ones from Mac don't work...