Spartan Gold: Bell 420 helicopter and more

"That's an expensive bird - a Bell 430."

The Bell 430 is a twin-engine light-medium helicopter built by Bell Helicopter. It is a stretched and more powerful development of the Bell 230, which, in turn, was based on the earlier Bell 222.

The Bell 430 features several significant improvements over the 230, the most significant of these being the new four-blade, bearingless, hingeless, composite main rotor. Although both the 230 and 430 are powered by Rolls-Royce (Allison) 250 turboshaft engines, the 430's engines are 10% more powerful. Other changes include the 1 ft 6 in (46 cm) stretched fuselage, providing for two extra seats, an optional EFIS flight deck, and a choice of either skids or retractable wheeled undercarriage.[1] The typical configuration seats ten, including a pilot and co-pilot with eight passengers in the main cabin behind them in three rows of seats. Six- and eight-place executive layouts are offered.

"the stubby cylindrical object in Kholkov's hand: compact submachine gun

A submachine gun (SMG) is an automatic carbine, designed to fire pistol cartridges. It combines the automatic fire of a machine gun with the cartridge of a pistol. The submachine gun was invented during World War I (1914–1918), but the zenith of its use was World War II (1939–1945) when millions of weapons of this type were manufactured. Today the submachine gun has mostly been replaced by the assault rifle for military use. (The assault rifle uses an intermediate-power cartridge with more power than a pistol but less than a standard rifle or battle rifle.)[2] [3] Even in roles where its been most used such as vehicle crews and personal defence (PDW), the SMG has been made redundant by weapons like the Colt M4. A major factor is the common use of body armour, where pistol calibers are simply insufficient for penetration - therefore the SMG is predominant in the civil security sector and is becoming obsolete in military use.

the firing resumed...the bullets penetrating four feet before their thrust fell off

Mythbusters tested this: http://kwc.org/mythbusters/2005/07/mythbusters_bulletproof_water.html If you're at an angle, bullets will lose impulse at 3 feet. If the bullet is being shot straight down into the water, 8 feet.