Revelation 16:18

16:18 Then57 there were flashes of lightning, roaring,58 and crashes of thunder, and there was a tremendous earthquake—an earthquake unequaled since humanity59 has been on the earth, so tremendous was that earthquake.

57	tn Here καί (kai) has been translated as “then” to indicate the implied sequence of events within the vision.
58	tn Or “sounds,” “voices.” It is not entirely clear what this refers to. BDAG 1071 s.v. φωνή 1 states, “In Rv we have ἀστραπαὶ καὶ φωναὶ καὶ βρονταί (cp. Ex 19:16) 4:5; 8:5; 11:19; 16:18 (are certain other sounds in nature thought of here in addition to thunder, as e.g. the roar of the storm?…).”
59	tn The singular ἄνθρωπος (anthrōpos) is used generically here to refer to the human race.