Big Picture: The 21-foot submersible (a vehicle made to explore underwater that must be launched from a ship) lost contact with the Canadian research ship it launched from about an hour and 45 minutes after it went underwater, set out to explore the wreckage of the Titanic in the Atlantic Ocean. The U.S. military, Canadian Armed Forces, Canadian Coast Guard, and commercial entities (deep sea companies) are working together in a search and rescue mission to locate and rescue the five people onboard the missing submersible. On Monday, Mauger noted that the location of the search area is "remote," and that "it is a challenge to conduct a search in that remote area, but we are deploying all available assets to make sure that we can locate the craft and rescue the people on board."

According to an advisor for the company that operates this submersible mission, OceanGate Expeditions, the submersible (called the Titan) had a 96-hour oxygen supply when it was launched around 6:00 a.m. on Sunday; "That means the oxygen supply could run out Thursday morning," The Associated Press reports. On Monday, Mauger said the search and rescue team is "making the best use of every moment of that time to locate the vessel."

In a press briefing at noon central time on Tuesday, Captain Jamie Frederick of the U.S. Coast Guard said search efforts thus far have not provided any results. Frederick said an "unwavering effort" will continue in the search for the sub, noting that the "nation's best experts" are a part of the search.

Coast Guard says extensive search has yielded no sign of missing sub

Watch Monday's press conference by the U.S. Coast Guard HERE

Watch Tuesday's press conference by the U.S. Coast Guard HERE

U.S., Canadian Coast Guards Searching for 5 Aboard Missing Submersible on Titanic Dive

Missing Submersible: Live Updates from The New York Times