The Hall City Cave is a limestone cave system near Hayfork, California, United States. Exploration was documented in 1903, with a Permian age ammonite fossil discovered. [1]
A cavern in the Hall City Cave contains a deep shaft of water. [2]
The Hall City Cave was a sacred place for the Nor-el-muk and other Wintu Native Americans. Edith Van Allen Murphy interviewed a long-surviving Wintu woman named Lucy; the papers are kept at the Held-Poage Museum in Ukiah, California in the Estle Beard Notes, box 2, Notebook g, p 15
The cave is purported to contain a treasure consisting of $40,000 in gold. The story goes that two miners carrying the gold were ambushed and murdered by two natives. The natives were tracked down by a posse who demanded to be told the location of the gold. The natives stated that they had dropped the gold in a water-filled shaft at the back of the cave. However, there appears to be no newspaper reports of this particular ambush and murders, though there is a report of two miners being murdered and the gold being buried on one of the river flats of the upper Trinity River. [3]
In 2012, a DIY open-source remotely operated vehicle (OpenROV) was used to explore the shaft.
A remotely operated underwater vehicle (ROUV) or remotely operated vehicle (ROV) is a free-swimming submersible craft used to perform underwater observation, inspection and physical tasks such as valve operations, hydraulic functions and other general tasks within the subsea oil and gas industry, military, scientific and other applications. ROVs can also carry tooling packages for undertaking specific tasks such as pull-in and connection of flexible flowlines and umbilicals, and component replacement.
An underwater environment is a environment of, and immersed in, liquid water in a natural or artificial feature, such as an ocean, sea, lake, pond, reservoir, river, canal, or aquifer. Some characteristics of the underwater environment are universal, but many depend on the local situation.
The Wintu are Native Americans who live in what is now Northern California. They are part of a loose association of peoples known collectively as the Wintun. There are three major groups that make up the Wintu speaking people. The Wintu, Nomlaki, and Patwin. The Wintu language is part of the Penutian language family.
The Trinity River is a major river in northwestern California in the United States and is the principal tributary of the Klamath River. The Trinity flows for 165 miles (266 km) through the Klamath Mountains and Coast Ranges, with a watershed area of nearly 3,000 square miles (7,800 km2) in Trinity and Humboldt Counties. Designated a National Wild and Scenic River, along most of its course the Trinity flows swiftly through tight canyons and mountain meadows.
Beaconsfield is a former gold mining town near the Tamar River, in the north-east of Tasmania, Australia. It lies 40 kilometres north of Launceston on the West Tamar Highway. It is a rural and residential locality in the local government areas (LGA) of West Tamar and Latrobe in the Launceston and North-west and west LGA regions of Tasmania. The 2016 census has a population of 1298 for the state suburb of Beaconsfield.
The Comstock Lode is a lode of silver ore located under the eastern slope of Mount Davidson, a peak in the Virginia Range in Virginia City, Nevada, which was the first major discovery of silver ore in the United States and named after American miner Henry Comstock.
Turtle Bay Exploration Park is a 300-acre, mostly outdoor cultural center located in Redding, California. Situated along the banks of the Sacramento River, the park features the Turtle Bay Museum, as well as the Sundial Bridge, a 700-foot long, 23-foot wide footbridge designed by architect Santiago Calatrava. In addition, the park has indoor and outdoor animal exhibits, gardens, and playgrounds for children. The museum features educational programs and exhibitions on the Wintu people, including a full-size shelter.
Castle Crags is a dramatic and well-known rock formation in Northern California. Elevations range from 2,000 feet (610 m) along the Sacramento River near the base of the crags, to over 6,500 feet (2,000 m) at the summit of the tallest crag.
The Shastan peoples are a group of linguistically related Indigenous peoples from the Klamath Mountains. They traditionally inhabited portions of several regional waterways, including the Klamath, Salmon, Sacramento and McCloud rivers. Shastan lands presently form portions of the Siskiyou, Klamath and Jackson counties. Scholars have generally divided the Shastan peoples into four languages, although arguments in favor of more or fewer existing have been made. Speakers of Shasta proper-Kahosadi, Konomihu, Okwanuchu, and Tlohomtah’hello "New River" Shasta resided in settlements typically near a water source. Their villages often had only either one or two families. Larger villages had more families and additional buildings used by the community.
The Scorpio is a brand of underwater submersible Remotely Operated Vehicle (ROV) manufactured by Perry Tritech used by sub-sea industries such as the oil industry for general operations, and by the Royal Navy and the United States Navy for submarine rescue services. Originally developed by AMETEK Straza of El Cajon, United States, they were subsequently developed by Perry Tritech. Although the design of the original Scorpio is over several decades old, it forms the basis for a current generation of Scorpio-branded ROVs. Scorpio ROVs are named in a sequence following the order of manufacture, such as "Scorpio 17" or "Scorpio 45" which refer to specific ROVs.
The Monterey Bay Aquarium Research Institute (MBARI) is a private, non-profit oceanographic research center in Moss Landing, California. MBARI was founded in 1987 by David Packard, and is primarily funded by the David and Lucile Packard Foundation. Christopher Scholin serves as the institute's president and chief executive officer, managing a work force of approximately 220 scientists, engineers, and operations and administrative staff.
Subsea technology involves fully submerged ocean equipment, operations, or applications, especially when some distance offshore, in deep ocean waters, or on the seabed. The term subsea is frequently used in connection with oceanography, marine or ocean engineering, ocean exploration, remotely operated vehicle (ROVs) autonomous underwater vehicles (AUVs), submarine communications or power cables, seafloor mineral mining, oil and gas, and offshore wind power.
A silt out or silt-out is a situation when underwater visibility is rapidly reduced to functional zero by disturbing fine particulate deposits on the bottom or other solid surfaces. This can happen in scuba and surface supplied diving, or in ROV and submersible operations, and is a more serious hazard for scuba diving in penetration situations where the route to the surface may be obscured.
The Chinese 8A4 class ROUV is a remotely operated underwater vehicle (ROUV) used to perform various underwater tasks, ranging from oil platform service to salvage and rescue missions. The 8A4 is a member of a series of related ROUVs developed by the Shenyang Institute of Automation (SIA) in the People's Republic of China (PRC). The predecessor to the 8A4 was the RECON-IV, an improved version of the American RECON-III. The 8A4 itself is an upgraded version of the American AMETEK 2006, and the 7B8 is an improved version of the 8A4.
The Bridge Gulch massacre, also known as the Hayfork massacre or Natural Bridge massacre, occurred on April 23, 1852, when more than 150 Wintu people were killed by about 70 American men led by William H. Dixon, the sheriff of Trinity County in northern California.
OpenROV was a marine robotics company focused on democratizing underwater exploration through the development of low cost Remotely Operated Vehicle (ROV) technology and an online community of citizen scientists and makers. OpenROV created a series of ROV kits as well as a ready-to-use ROV called Trident, both of which were launched on the crowdfunding platform, Kickstarter. OpenROV was founded by David Lang and Eric Stackpole in 2011, and was based for most of its history in Berkeley, CA. In 2019, OpenROV merged with Spoondrift Technologies to create Sofar Ocean Technologies.
The California Indian Wars were a series of wars, battles, and massacres between the United States Army, and the Indigenous peoples of California. The wars lasted from 1850, immediately after Alta California, acquired during the Mexican–American War, became the state of California, to 1880 when the last minor military operation on the Colorado River ended the Calloway Affair of 1880.
The following index is provided as an overview of and topical guide to underwater diving: Links to articles and redirects to sections of articles which provide information on each topic are listed with a short description of the topic. When there is more than one article with information on a topic, the most relevant is usually listed, and it may be cross-linked to further information from the linked page or section.
Diving support equipment is the equipment used to facilitate a diving operation. It is either not taken into the water during the dive, such as the gas panel and compressor, or is not integral to the actual diving, being there to make the dive easier or safer, such as a surface decompression chamber. Some equipment, like a diving stage, is not easily categorised as diving or support equipment, and may be considered as either.
Underwater exploration is the exploration of any underwater environment, either by direct observation by the explorer, or by remote observation and measurement under the direction of the investigators. Systematic, targeted exploration is the most effective method to increase understanding of the ocean and other underwater regions, so they can be effectively managed, conserved, regulated, and their resources discovered, accessed, and used. Less than 10% of the ocean has been mapped in any detail, less has been visually observed, and the total diversity of life and distribution of populations is similarly obscure.