SAS Assegaai, Naval submarine museum in Simon's Town, South Africa

SAS Assegaai is a decommissioned submarine on display at Simon's Town harbor in South Africa. The vessel is open to the public and lets visitors walk through the original control room, crew quarters, and operational systems.

The submarine entered service in 1971 and served in the South African Navy for several decades. It was decommissioned in 2003 and later prepared for public display.

The boat was renamed SAS Assegaai in 1999, when the three Daphné-class submarines received new names: SAS Spear, SAS Umkhonto and SAS Assegaai. The word assegaai is the Afrikaans and English form of the Arabic-derived term for a throwing spear. The submarine is now part of the South African Naval Museum, run with the South African Naval Heritage Trust.

The boat sits at Simon's Town harbor and can be explored from the inside, but the passages are narrow and some sections require ducking or climbing through hatches. Comfortable shoes and a readiness to move through tight spaces will make the visit easier.

During the South African Border War the boat took part in some ten clandestine special operations, and in 1975, before Operation Savannah, it was deployed into Angolan waters under Operation Yskas to prepare the evacuation of South African military personnel. Its hull number is S99.