Pictures by photographer Franco Banfi of his scuba diving colleague in White Sea on Russia's north-west coast (Arctic circle Dive Center, White Sea, Karelia, northern Russia). They dived 32ft in -2C and witnessed amazing colours created from humus - a component in soil's organic matter. Huge boulder...

Pictures by photographer Franco Banfi of his scuba diving colleague in White Sea on Russia's north-west coast (Arctic circle Dive Center, White Sea, Karelia, northern Russia). They dived 32ft in -2C and witnessed amazing colours created from humus - a component in soil's organic matter. Huge boulder...

Pictures by photographer Franco Banfi of his scuba diving colleague in White Sea on Russia's north-west coast (Arctic circle Dive Center, White Sea, Karelia, northern Russia). They dived 32ft in -2C and witnessed amazing colours created from humus - a component in soil's organic matter. Huge boulder...

Pictures by photographer Franco Banfi of his scuba diving colleague in White Sea on Russia's north-west coast (Arctic circle Dive Center, White Sea, Karelia, northern Russia). They dived 32ft in -2C and witnessed amazing colours created from humus - a component in soil's organic matter. Huge boulder...

Pictures by photographer Franco Banfi of his scuba diving colleague in White Sea on Russia's north-west coast (Arctic circle Dive Center, White Sea, Karelia, northern Russia). They dived 32ft in -2C and witnessed amazing colours created from humus - a component in soil's organic matter. Huge boulder...

Pictures by photographer Franco Banfi of his scuba diving colleague in White Sea on Russia's north-west coast (Arctic circle Dive Center, White Sea, Karelia, northern Russia). They dived 32ft in -2C and witnessed amazing colours created from humus - a component in soil's organic matter. Huge boulder...

Pictures by photographer Franco Banfi of his scuba diving colleague in White Sea on Russia's north-west coast (Arctic circle Dive Center, White Sea, Karelia, northern Russia). They dived 32ft in -2C and witnessed amazing colours created from humus - a component in soil's organic matter. Huge boulder...

Pictures by photographer Franco Banfi of his scuba diving colleague in White Sea on Russia's north-west coast (Arctic circle Dive Center, White Sea, Karelia, northern Russia). They dived 32ft in -2C and witnessed amazing colours created from humus - a component in soil's organic matter. Huge boulder...