Most passengers came from several cities in the San Francisco Bay Area to dive into colorful underwater marine life for three days, said Santa Barbara County Sheriff Bill Brown.
Only five people – all crew members – were found. alive and the bodies of 20 people have been restored off the coast of Santa Cruz Island. The search for survivors was halted after crews searched the sea for nearly 24 hours.
While the identity of those aboard the Concept was not disclosed by the authorities, here's what we know about some of them:  A marine biologist who grew up swimming near the Channel Islands and the owner of a company for diving in Santa Cruz, was aboard the Concept, her brother says.
Christie Finstad led the dive, Brett Harmeling wrote in a Facebook post.
I had "thousands of dives under my belt" and explored the marine life of the Tahitian Islands, Costa Rica and Australia, according to her company website.
"My mission is to inspire appreciation for our underwater world. I feel incredible about rtunate being in the service of helping people invest in lifelong experiences," she says in her biography.
Finstad and her husband also sailed across the South Pacific "to find new and amazing places" for their clients.  “Thank you ALL for your unconditional love and support during this incredibly tragic time. My family and I really appreciate it. Without a last word about my sister Christie; however, it is likely that she transferred to be with the good Lord, "writes Harmeling on Facebook on Tuesday.
Coles was a gal and cook at conception, his brother says
The lifelong surfer and father of the daughter usually made breakfast for the passengers on the ship at about 4 o'clock in the morning, James Colts told reporters on Monday while waiting for news about his brother.
Ali Kurtz made the most of home, diving into the ocean, her mother says.
Cherry McDonagh flew to Califo from Cincinnati, Ohio, after hearing about the Conception diving fire. Her 25-year-old
Kurtz has been working at Paramount Pictures for several years, but "wants to pursue her dreams of the ocean, the sea, to dive," he said her mother in front of reporters at a monument in the harbor of Santa Barbara.
"She was a sailor," her mother said. "She kindly edited it here and she loved the boat. She loved to dive, "
McDonough crashed to the ground and began to sob when he saw the picture of his daughter at the memorial. There are 34 candles for the 34 people who are presumed dead.
The message below said : "I love you Ali – and you know I always will. I'll miss you forever."
Physics teacher Raymond (Scott) Chan was aboard the Concept with her daughter, Fremont United School spokesman Brian Kilgour said.
“Mr. Chan was a beloved AHS teacher among students and colleagues, "the district said in a statement." His students knew him as an innovative and inspiring teacher who developed a passion for physics among his students. "
Chan has been teaching two AP physics tests in the field in the last three years, the statement said.
" His loss is a huge tragedy for our school district. "
Arizona resident Neil Balz was on a diving boat that went up in flames, his father, John Balz, told CNN as a CNN member.
Family of five
Five members of the Stockton, California, family were aboard the boat, Dominic Selga told CNN affiliate KOVR.
Selga said his mother, Fernisa Sison, was and on board with her husband Michael Kitasol and his three sisters Angela Kitasol, Evan and Nicole Kitasol Kitasol.