Delver's Call: The Sinkhole

Entrance to this delve is, unsurprisingly, through a very deep sinkhole at:
/way Hallowfall 50.75, 50.25 The Sinkhole Entrance

List of all Delver's Call quests, which can be completed at will:

* Delver's Call: Fungal Folly
* Delver's Call: Kriegval's Rest
* Delver's Call: Earthcrawl Mines
* Delver's Call: The Waterworks
* Delver's Call: Dread Pit
* Delver's Call: Nightfall Sanctum
* Delver's Call: Mycomancer Cavern
* Delver's Call: The Sinkhole
* Delver's Call: The Skittering Breach
* Delver's Call: The Underkeep
* Delver's Call: Tak-Rethan Abyss
* Delver's Call: Spiral Weave (yes, there's two different quest IDs depending on where you pick it up)
* Delver's Call: Spiral Weave

Script to check which Delver's Call quests you've done:

/run for _,i in ipairs({758;759;2648;2649;766;2664;769;767;768;2667;771;770;2666}) do i=i+83000 print(format("%s (%d): %s",C_QuestLog.GetTitleForQuestID(i),i,C_QuestLog.IsQuestFlaggedCompleted(i) and "\124cff00ff00Yes\124r" or "\124cffff0000No\124r")) end


There's also a few quests as part of the "Zekvir" storyline, which are sequential and require campaign progress:

Delve into the Earth

Requires completing [achievement=20118] campaign through The Fourth Seat.

Delves: The Waterworks

Delves: Nightfall Sanctum

Requires completing [achievement=20598] campaign through [quest=78607].

Delves: The Underkeep

Requires completing [achievement=19559] campaign through The General's Consensus.

Script to check which Zekvir quests you've done:

/run for _,i in ipairs({78464;83749;83755;83761}) do print(format("%s (%d): %s",C_QuestLog.GetTitleForQuestID(i),i,C_QuestLog.IsQuestFlaggedCompleted(i) and "\124cff00ff00Yes\124r" or "\124cffff0000No\124r")) end


Water breathing elixirs work here and save you the headache of worrying about stupid air bubbles.

Draenic Water Breathing Elixir is the cheapest on the AH, only 40+g. It lasts for 2 hours. You will lose it if you die since it's an elixir.

Air bubbles will still give you a 5s 100% move speed buff [spell=430239], although it incorrectly says swim speed.

Note that if you want Just Keep Swimming, it's best to first enter the water and let your breath meter appear before using the elixir.