Ebenezer Clifford, a 19th-century planemaker in Maine, supplemented his income by diving for shipwrecks. He used a diving suit of his own design, featuring a helmet with a glass faceplate and a flexible hose supplying air from the surface. Clifford’s diving exploits, recovering items like anchors and cannons, were well-known locally. He apparently applied his ingenuity to both planemaking and diving, showcasing a remarkable combination of craftsmanship and adventurous spirit.
This 2021 blog post argues against prematurely optimizing code for performance, using the analogy of a free diver holding their pee to dive deeper. While holding your pee might offer a tiny perceived advantage in the short term, it's ultimately detrimental to your overall performance and can even be harmful. Similarly, micro-optimizations early in a project often add complexity, make the code harder to understand and maintain, and ultimately hinder progress toward larger, more impactful optimizations later on. Focus on writing clean, clear code first and address performance bottlenecks only when they become a proven problem, allowing for more effective and impactful optimization strategies when they are actually needed.
Hacker News users discuss the potential benefits and drawbacks of intentionally dehydrating for freediving, as described in the linked article. Some express skepticism about the practice, citing potential health risks and questioning the claimed performance gains. Others share anecdotes of unintentionally experiencing similar effects due to pre-dive nervousness or limited access to fluids. The validity of the "mammalian diving reflex" and its role in freediving is also debated, with some users pointing out its limitations and emphasizing the importance of proper training and safety precautions. A few commenters highlight the ethical considerations of promoting potentially dangerous practices, particularly to novice freedivers. Overall, the discussion reveals a mixed reception to the article's central premise.
Divers trapped aboard a burning Red Sea liveaboard dive boat for 35 hours recounted harrowing escapes. Some jumped from the upper decks into the darkness, while others waited for rescue boats, navigating through smoke and flames. The fire, believed to have started in the engine room, rapidly engulfed the Hurricane dive boat, forcing passengers and crew to abandon ship with little warning. While all 55 passengers and crew survived, some suffered burns and other injuries. Egyptian authorities are investigating the cause of the fire.
HN commenters discuss the harrowing experience of the divers, with several focusing on the psychological impact of being trapped in the dark for so long. Some question the decision-making of the dive operator, particularly the lack of readily available emergency communication and the delay in rescue efforts. Others praise the divers' resilience and resourcefulness in escaping the sinking boat, highlighting the importance of dive training and maintaining composure in emergencies. A few commenters share personal anecdotes of similar close calls while diving, emphasizing the inherent risks involved in the activity. The discussion also touches on the potential legal ramifications for the dive operator and the need for stricter safety regulations in the diving industry.
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https://news.ycombinator.com/item?id=43225805
Hacker News users discussed the intriguing story of Ebenezer Clifford, a planemaker and diving bell inventor. Several commenters focused on the ingenuity of Clifford's diving bell design, particularly its use of a weighted bellows system for air replenishment. Some debated the historical accuracy of attributing the invention solely to Clifford, pointing to earlier diving bell iterations. Others expressed fascination with Clifford's dual professions and the potential connection between woodworking precision and the technical demands of underwater exploration. A few users shared additional resources about early diving technology, highlighting the dangers and limitations of these pioneering devices. The overall sentiment was one of admiration for Clifford's ingenuity and the historical context of his inventions.
The Hacker News post "The Planemaker Who Walked Beneath the Water" (linking to an article about Ebenezer Clifford, a diving bell inventor and planemaker) has generated several comments, offering various perspectives and additional information.
One commenter points out the impressive feat of Clifford's diving bell invention, highlighting its use in salvage operations and mentioning its remarkable depth capability of 23 fathoms (138 feet). They express fascination with the technology of the time and how such a device could operate at that depth.
Another comment elaborates further on the historical context of diving bells, drawing a parallel between Clifford's bell and the earlier one designed by Edmund Halley. They explain that Halley's bell replenished its air supply by sending weighted barrels of air down to the bell, a method that Clifford's design seemingly improved upon.
A separate comment shifts the focus to the woodworking aspect, expressing admiration for Clifford's craftsmanship as a planemaker. They link this skill to the precision and ingenuity required for building a diving bell, suggesting a correlation between the two pursuits.
Furthering the discussion on the diving bell's mechanics, another commenter questions how the air pressure inside the bell was managed, speculating about the potential discomfort or danger of rapid pressure changes during ascent and descent. They also wonder about the effects of the increased air pressure at such depths.
Another commenter picks up on the pressure discussion, pointing out the significant pressure at 23 fathoms and suggesting that even a slow ascent would necessitate decompression stops to avoid the bends. This introduces a modern diving concept into the historical context, raising questions about the diving practices of that era.
Finally, a comment contributes a personal anecdote about diving in a similar antique diving helmet. They describe the experience of breathing compressed air and the restricted field of vision, offering a glimpse into what using such equipment might have been like.
The comments overall demonstrate a blend of curiosity about the historical technology, admiration for Clifford's skills, and a thoughtful consideration of the practical challenges associated with early diving. They enrich the original post by providing additional context and perspectives on both the diving bell and the planemaking aspects of Clifford's life.