Usually Velcro
Apollo 4 was a test flight that did not have a crew. It launced November 9, 1967.
Pacific ocean
Apollo 7 was the first three person American space mission launching on October 11th, 1968. The crew consisted of Mission Commander Walter "Wally" Shirra, Command Module Pilot Donn Eisele, and Lunar Module Pilot Walter Cunningham. They successfully splashed down on the 22nd of October.
Apollo 13 returned to Earth on April 17, 1970. The spacecraft splashed down in the Pacific Ocean, successfully concluding its mission after experiencing an oxygen tank explosion that jeopardized the crew's safety.
The Apollo 13 crew used the Lunar Module as a lifeboat after an oxygen tank exploded, damaging the Service Module. They made critical repairs and used the gravitational pull of the Moon to slingshot back towards Earth, re-entering the atmosphere and splashing down safely in the Pacific Ocean.
The Apollo 13 crew returned safely to Earth by using the lunar module as a lifeboat after an oxygen tank explosion caused a major power loss on the spacecraft. The crew improvised a way to conserve resources and overcome numerous challenges to successfully re-enter Earth's atmosphere and splash down in the Pacific Ocean.
The Apollo 13 crew got cold because their spacecraft's heating system was shut down to conserve power after an oxygen tank explosion. This led to the temperature inside the spacecraft dropping significantly, making it very cold for the astronauts.
Apollo 7 did not land on the Moon; it was the first crewed mission in NASA's Apollo program and orbited the Earth for 11 days in 1968. The crew splashed down in the Atlantic Ocean upon completing their mission.
The crew from Apollo 13 got back to Earth by using the Lunar Module as a lifeboat after an oxygen tank on their Service Module exploded, forcing them to abort their mission to land on the moon. They managed to execute a challenging manual re-entry sequence with the help of flight controllers on Earth and safely splashed down in the Pacific Ocean.
During the Apollo 13 mission, the temperature on board the spacecraft dropped to around 38°F (3.3°C) as the crew had to power down various systems to conserve energy after the oxygen tank explosion.
Apollo 13 did not crash. It experienced an oxygen tank explosion that led to a critical failure of the spacecraft's systems, forcing the crew to abort the mission and return to Earth using the Lunar Module as a lifeboat. The crew successfully splashed down in the Pacific Ocean on April 17, 1970.
Yes they did. By using the Lunar Module (LM or LEM) built to land on the surface of the moon as a lifeboat. The crippled command module and the damaged service module had to be shut down to conserve power and resources for the astrnauts to survive.