The Short Version
No single verified Dhanbad subsidence event matches all three elements of this claim simultaneously. The "more than 20 houses" figure comes from one outlet's account of an April 24 incident, but other sources covering the same date report only 3–10 houses. The "approximately 20 feet deep" detail traces to a separate March 31/April 1 collapse involving just 2 houses. The "midnight" timing is unsupported by any source; the April 24 event is reported at approximately 9 pm. The claim conflates multiple incidents with an invented timestamp.