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A firm developing zero-emission submarines which could transport cargo between Glasgow and Belfast has been awarded a share of £23m of UK Government green maritime funding.

The fully automated vessels are designed to be “net positive” by running on green hydrogen and collecting microplastics, the Department for Transport (DfT) said.

A fleet could secure 27 tonnes of CO2 emissions in the first year of operation, according to the DfT.

Another project awarded UK Government funding is developing electric boat chargepoints connected to offshore wind turbines.

They would operate in a similar way to electric car chargers, with sailors plugging in, charging their vessel and sailing away.

The use of renewable energy in this way could be equivalent to taking more than 62,000 cars off the road, the DfT said.

The competition winners were announced as part of London International Shipping Week.

Transport secretary Grant Shapps said: “As a proud island nation built on our maritime prowess, it is only right that we lead by example when it comes to decarbonising the sector and building back greener.