DIMDEX 2026: ST Engineering unveils amphibious Terrex s5, signs Qatar services agreement

ST Engineering's amphibious, seagoing Terrex s5 IFV variant, unveiled at DIMDEX 2026. (Janes/Tom Barton)

Singapore's ST Engineering unveiled its seagoing amphibious Terrex s5 infantry fighting vehicle (IFV) at the DIMDEX defence exhibition held in Doha, Qatar, from 19 to 22 January 2026.

The Terrex s5 is 8.3 m long, 3 m wide, and 2.7 m high without top-mounted weapons. It can carry a 13 tonne payload and has a crew complement of 12, according to the company.

Lin Xiaoning, senior principal engineer at ST Engineering's integrated engineering hub for land defence systems, confirmed to Janes at DIMDEX 2026 that the amphibious variant displayed could operate up to Sea State 3.

This was previously stated by ST Engineering in December 2024 when it signed a partnership agreement with Kazakhstan Paramount Engineering (KPE) to supply a new 8×8 amphibious armoured vehicle, based on the design of the Terrex 2, to the Kazakhstan military.

A total of 200 amphibious Terrex vehicles are being produced under that partnership with KPE, said Xiaoning, modifying existing vehicles rather than building them from scratch.

The swim kit applied to the Terrex s5 included two propellers at the back, allowing it to travel at 8–10 km/h in the water. That water propulsion, buoyancy system, propulsion control, and associated equipment mean that the s5's armour had to be reduced from level 6 on the standard (non-amphibious) 35 tonne variant.

Weighing 32 tonnes, the amphibious s5 has NATO STANAG 4569 kinetic energy protection level 4 (KE4) and mine blast protection level 4a and 4b (MB 4a/4b).