A level 18 quest for the Alliance, from level 16.
Unchanged in Forever as far as is known: the text, objectives and rewards below are Classic’s.
Return to Chief Engineer Hinderweir and show him the clue that you discovered.
Provided: 
Strange Smelling Powder
You take a sample of the strange smelling powder.
Experience: 1,350
Did you happen to discover any clues, ‹name›?
This is an alarming discovery, to say the least!
7 quests from level 18 to 20, 7,690 XP in all.
Investigate the area near the eastern ramp of the Dam and bring Chief Engineer Hinderweir a clue that might reveal what the Dark Iron Dwarves are up to.
Chief Engineer Hinderweir VIILoch Modan
675 XP
[18]A Dark Threat Loomsthis quest
Return to Chief Engineer Hinderweir and show him the clue that you discovered.
Suspicious BarrelLoch Modan
1,350 XP
Chief Engineer Hinderweir wants you to take the strange smelling powder to Ashlan Stonesmirk, the explosives expert in Dun Modr.
Chief Engineer Hinderweir VIILoch Modan
1,350 XP
Ashlan Stonesmirk wants you to return to Chief Engineer Hinderweir and inform him of the new discovery.
Ashlan StonesmirkWetlands
340 XP
Chief Engineer Hinderweir wants you to gather Lurker Venom, a Mo'grosh Crystal, and a Crocolisk Tear.
Chief Engineer Hinderweir VIILoch Modan
1,350 XP
Chief Engineer Hinderweir wants you to swim down to the base of the dam, locate the powder keg and stir in the Disarming Mixture to prevent an explosion.
Chief Engineer Hinderweir VIILoch Modan
675 XP
The Disarming Mixture seemed to take effect.
Explosive ChargeLoch Modan
1,950 XP
Text, givers, objectives and rewards come from the cMaNGOS Classic database (a reconstruction of the 1.12 world), with what Forever changed on top: the game server’s own answers where we have them, else Wowhead’s Forever database. Places are Classic’s, shown on the Forever maps. Quest text © Blizzard Entertainment.
