21: Two One 21: Two One 21: Two One is a Japanese murder mystery visual novel developed by BasiL, it was first released as an adult PC game for Microsoft Windows on May 25, 2001. "21: Two One" was later released for the Dreamcast by PrincessSoft on December 27, 2001. The game is the second installment by BasiL, and after the completion of "21: Two One", BasiL went on to create their third and final eroge, Cherry Petals Fall Like Teardrops, before forming a new company called Navel. The story follows a young man called Takuya Kirishima, who is a talented surgeon and
Rule of thirds (diving) Rule of thirds (diving) In scuba diving, the rule of thirds is a rule of thumb used by divers to plan dives so they have enough breathing gas remaining in their diving cylinder at the end of the dive to be able to complete the dive safely. This rule generally only applies to diving in overhead environments, such as caves and wrecks, where a direct ascent to the surface is impossible and the divers must return the way they came. For divers following the rule, one third of the gas supply is planned for the outward journey, one third is