Here is a concise summary of the provided text:
**The Baltic Sea Anomaly**
* Renowned underwater explorers Peter Lindbergh and Denis Asberg discovered an unidentified object in the Baltic Sea using powerful sonar.
* The object is approximately 60 meters in diameter, with unusual shapes and indentations, sparking intense speculation.
* Experts, including those who debunk UFO myths, are baffled, with theories ranging from a natural formation to a military prototype or even a pre-Ice Age structure.
* Lindbergh himself stated that, if man-made, the object's construction would predate the Ice Age.
* Despite multiple expeditions (latest in 2012), harsh weather conditions, equipment failures, and significant financial costs have hindered further exploration.
* The mystery remains unsolved, with the Baltic Sea Anomaly considered the world's number one enigma among unexplained underwater objects.
Here are the key facts extracted from the text, each with a number and in short sentence form, excluding opinions:
1. **Discovery Location**: The anomaly was discovered at the bottom of the Baltic Sea.
2. **Discoverers' Background**: Peter Lindbergh and Denis Asberg are renowned for searching for lost objects, not paranormal or extraterrestrial activities.
3. **Previous Discoveries**: They previously found a submerged B-17 bomber and 2,400 unopened bottles of 1907 champagne.
4. **Discovery Method**: The anomaly was found using an extremely powerful sonar to comb the Baltic Sea.
5. **Object Size**: The object is estimated to be approximately 60 meters in diameter.
6. **Initial Expert Assessment**: Experts initially clarified it's unlikely to be a giant stone due to its shape and indentations.
7. **Later Expert Statement**: Peter Lindbergh suggested the object could be a construction prior to the ice age, given the rocks above it.
8. **Expedition Challenges**: Explorations were hindered by adverse weather conditions, equipment failures, and high costs (estimated €7,000 per day).
9. **Government Response**: Governments were asked for help to subsidize the exploration but refused.
10. **Latest Theories (Fact of Existence, Not the Theory Itself)**: As of the document's time, one of the latest theories suggested the object could be related to a movement, without explaining its unusual appearance.
11. **Last Recorded Exploration**: One of the last explorations took place in July 2012, aimed at retrieving objects near the anomaly for further study.
12. **Financial Impact**: The company was greatly weakened financially due to the expeditions.