The Bloop Faq: Everything You Need to Know About the South Pacific’s Loudest Mystery
By James H. Sterling
Did NOAA ever claim the sound was caused by an unknown animal?
No. While early researchers acknowledged that the frequency sweep resembled certain biological profiles more than tectonic earthquakes, official oceanographic assessments never concluded it was an organism. NOAA formalized the icequake explanation once dedicated Antarctic hydrophone data matched the 1997 recording.
Could an undiscovered giant animal still be responsible for the sound?
The laws of biomechanics rule this out. The energy necessary to propagate across 5,000 kilometers requires an acoustic output exceeding 210 decibels. No organism could physically generate or survive that level of internal acoustic cavitation without massive, catastrophic organ damage.
What was the "Julia" sound, and is it related to the Bloop?
Julia was another famous unidentified ocean sound recorded by NOAA on March 1, 1999. Much like the Bloop, Julia lasted for roughly 15 seconds and registered across the entire equatorial array. PMEL acoustics teams confirmed that Julia was also an Antarctic cryoseism, traced to a large iceberg that ran aground off Cape Adare.
James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.
