This incredible footage shows the moment a small plane crashes into the ocean off the California coast - before a pilot and his passenger on board filmed their own rescue while being stung by jelly fish and treading water.

Pilot Owen Leipelt filmed as the engine on his friend's new Beechcraft Bonanza light aircraft failed and the plane hit the water off Half Moon Bay. Leipelt alerted air traffic control to the incident as he kept circling above the crash scene on Tuesday.

In the water below, pilot of the downed aircraft, David Lesh, 34, was also filming on his waterproof phone as he and his only passenger, who has not been identified, found themselves treading water for 40 minutes before being rescued. They were unharmed.

Lesh told NBC and KRON4: 'I was probably 3,400 feet, did everything I could. I couldn't get the motor running and put it into the Pacific.

'We skipped along the water for a few hundred feet and the impact was very minimal, it was not hard at all and we immediately opened the door and got out onto the wing.

'We took a quick inventory of what was in the plane. I grabbed my cell phone and the keys to the car.

'I knew we had about 20 or 30 seconds before it sunk.'

The National Transportation Safety Board and the Federal Aviation Administration will investigate the accident, a spokesman confirmed to the DailyMail.com.

A spokesman for the FAA said: 'The FAA and NTSB will investigate. The NTSB is the lead agency and it typically takes the NTSB a year or more to determine a probable cause of an accident.'

Lesh said he believes bad gasoline caused the plane to malfunction.

David Lesh and his passenger seemed in good spirits, laughing and joking as they found themselves treading water while waiting to be rescued

Lesh filmed as his single-engine Beechcraft Bonanza sank into the pacific after he crashed off the coast of Half Moon Bay on Tuesday

Both Lesh and his female passenger were rescued unharmed by the coast guard. Footage shows the pair of them waiting on the wing of the plane before it sunk

Pilot Owen Leipelt filmed as his friend's plane hit the water off Half Moon Bay. He alerted air traffic control and kept circling above the crash scene on Tuesday, pictured

Incredible pictures show the plane sinking and the two survivors bobbing in the water as the helicopter arrives.

They even seem in good spirits, laughing and joking in the water before their rescue.

Professional skier and experienced pilot Lesh shows his female friend smiling widely as they are taken to safety.

Lesh, who owns a clothing company, added: 'It got cold pretty quickly. After about 20 minutes or so, I started to freeze up pretty good. There was jellyfish everywhere. There was sunfish. There was whales breaching around us.

'We just waited as long as we could on the wing. The plane went down, we got into the water. Jellyfish were stinging us the entire time we were in there.'

Lesh, who regular posts pictures of his adventures in his plane online and boasts more than 35,000 followers on Instagram, joked on April Fools Day that his plane had crashed in Mexico.

He wrote in a post shortly after buying the new plane: 'After 9 years of unforgettable flying adventures around the US, Central America and the Caribbean, I'm putting my Lance up for sale.

'It's time for someone else to enjoy it. I've got a new plane on the way, one that is faster and more capable, one that will facilitate my freedom and lust for punching holes in the sky.'

Following the incident Tuesday he said he told his female companion to take anything that would float, like seat cushions.

Emergency crews responded to a call at around 6.15pm, according to the according to Federal Aviation Administration.

Lesh and Leipelt had left from Reid-Hillview Airport in San Jose and took to the sky to take photos of Lesh's new plane which he had for just a couple of weeks.

Pilot Owen Leipelt filmed as the engine on his friend's new Beechcraft Bonanza light aircraft failed and the plane hit the water off Half Moon Bay, pictured

Lesh, left,said he told his female companion, right, to take anything that would float, like seat cushions. Emergency crews responded to a call at around 6:15 p.m, according to the according to Federal Aviation Administration

The plane had left from Reid-Hillview Airport in San Jose before it lost power. Lesh was able to skip the plane along the surface of the water before it finally crashed and sank

After the pair were recused Lt. Cmdr. Joshua Murphy said: The second pilot's quick response to report the downed plane and remain on scene greatly aided the Coast Guard's prompt response and ability to save two lives'

A spokesman for the NTSB said they are 'currently monitoring this accident until the aircraft has been recovered'.

The added: 'At that point, NTSB will more than likely work with the FAA on assessing the damage to the aircraft and from that will make a decision as to whether the NTSB will conduct a full investigation.'

Leipelt said: 'Your heart sinks when you hear, 'Mayday, I have no power'. It's something you don't want to hear, and it takes a second to kick in.'

He told KTVU: 'I had been circling him the whole time, from the time it impacted water. For about 10 minutes I couldn't see him.'

The pilot said he has 'never been so relieved in my life to hear him on the phone' when Lesh called him 10 minutes later.

Lesh said he bought the plane nearly three months ago for more than $200,000 and spent about $40,000 for upgrades. He said Tuesday's flight was its first real trip.

Addressing online speculation that he had staged the water landing, Lesh said anyone who believed he would spend so much money on a plane only to sink it must have 'lost their mind.'

Lesh is described on Virtika's website as a thrill-seeker and skier who lived in Chicago, India and Wisconsin before moving to Colorado.

His Instagram profile shows him flying, skiing and snowmobiling in picturesque locations across the globe.

Lesh shows his friend smiling widely as they are taken to safety in the incredible footage

Lt. Cmdr. Joshua Murphy credited pilot Owen Leipelt, left, with helping to save two lives. David Lesh, right, said the water 'got cold pretty quickly' and he started to 'freeze up pretty good' after around 20 minutes

He wrote in a post shortly after buying the new plane: 'I've got a new plane on the way, one that is faster and more capable, one that will facilitate my freedom and lust for punching holes in the sky'

The friends had left from Reid-Hillview Airport in San Jose and were in the air together to take pictures of Lesh's brand new plane when it lost power. Lesh is pictured with one of his planes

He told ABC7: 'David called me on the phone as he was bobbing in the water. He turned me around and he guided me right to where he was.'

Lt. Cmdr. Joshua Murphy said: 'We got the call, we responded immediately, headed directly out there and were able to find the orbiting aircraft and then find the people in the water.

'The second pilot's quick response to report the downed plane and remain on scene greatly aided the Coast Guard's prompt response and ability to save two lives.'