The following options are available: MODEL Splash VR2 Standard VR2 Upgrades B1 to B2 OC Air/Nitrox to OC & CC Air/Nitrox + 58 B1 to B3 OC Air/Nitrox to OC Trimix + 114.00 B1 to B4 OC Air/Nitrox to OC & CC Air/Nitrox Trimix + 173.90 B2 to B4 OC + CC Air/Nitrox to OC + CC Air/Nitrox/Trimix + 116.33 B2 to B3 OC & CC Air/Nitrox to OC Trimix + 56.40 B3 to B4 OC Air/Nitrox/Trimix to OC & CC Air/Nitrox/Trimix + 55.23