Mae'r haul yn tywynnu trwy'r coed trwchus, gan greu cysgodion ar hyd llawr y goedwig.

The sun shone through the dense trees, casting shadows along the forest floor.

Alys a Gareth cerdded yn araf tuag at fynedfa cudd y bunkeri gyfrinachol.

Alys and Gareth walked slowly towards the hidden entrance of the secret bunker.

Roedd y ddau wedi clywed am y bunkeri hon drwy'r gymdeithas hanes lleol, ac roeddent yn gyffrous i ddechrau eu gwaith gwirfoddol.

They had heard about this bunker through the local history society and were excited to begin their volunteer work.

Roedd Alys yn barod i ddarganfod straeon cudd o'r gorffennol, tra roedd Gareth eisiau deall pensaernïaeth y bunkeri er mwyn ysbrydoli ei brosiectau adnewyddu.

Alys was eager to uncover hidden stories from the past, while Gareth wanted to understand the architecture of the bunker to inspire his renovation projects.

Wrth agor drws trwm y bunkeri, fe gawsant eu croesawu gan arogl musty papur a metel rhydu.

As they opened the heavy door of the bunker, they were greeted by the musty smell of paper and rusting metal.

Roedd colau lampau eu pennau yn bownsio oddi ar wal y bunkeri, yn datgelu'r cofnodion hanesyddol wedi'u pacio ar y silffoedd.

The beams of their headlamps bounced off the bunker walls, revealing historical records packed on the shelves.

Roedd gwaith caled o'u blaenau, ond roeddent yn gwybod y byddai eu hymdrechion yn rhoi golwg newydd ar hanes.

There was hard work ahead of them, but they knew their efforts would bring a fresh perspective on history.

"Cawn ni ddechrau yma," meddai Alys gyda chyffro yn ei llais, yn pwyntio tuag at gabinet mawr llawn dogfennau.

"We can start here," said Alys excitedly, pointing to a large cabinet full of documents.

"Mae llawer o bethau i'w ddarganfod.

"There are many things to discover."

"Roedd Gareth yn edrych o'i amgylch, chwilio am unrhyw fanylion pensaernïol sydd a allai ddangos technegau'r adeiladwyr.

Gareth looked around, searching for any architectural details that might reveal the builders' techniques.

Roedd y bunkeri yn llawer mwy cymhleth na'r disgwyl.

The bunker was much more complex than expected.

"Mae'n rhaid i ni wneud yn gyflym," dywedodd, gan gofio'r pwysau o'i waith arall.

"We need to work quickly," he said, remembering the pressure from his other work.

Ond roedd Alys yn gwybod bod angen mwy o amser arnynt i wneud y gwaith yn iawn.

But Alys knew they needed more time to do the job properly.

"Dwi angen mwy o amser," meddai Alys yn ddi-oed.

"I need more time," Alys said firmly.

"Mae'n rhaid i mi archwilio'r dogfennau hyn yn drylwyr.

"I have to thoroughly examine these documents.

Bydd yn cymryd mwy o amser na'r disgwyl.

It will take longer than expected."

"Roedd Gareth yn meddwl am y prosiectau eraill oedd yn aros amdano, ond gwnaeth benderfyniad pwysig.

Gareth thought about the other projects awaiting him but made an important decision.

"Byddaf yn gohirio fy mhrosiectau eraill i dy helpu," dywedodd yn bendant.

"I will delay my other projects to help you," he said decisively.

"Rydym yn gallu cydweithio'n agosach i gyfuno ein harbenigedd.

"We can work more closely together to combine our expertise."

"Wrth iddi nosi, roedd Alys a Gareth yn parhau i weithio yn y bunkeri, yn chwilio am bob cliw a hanes.

As night fell, Alys and Gareth continued working in the bunker, searching for every clue and piece of history.

Roedd yn waith caled, ond roeddent yn medru gweld y diwedd.

It was hard work, but they could see the end in sight.

Un noswaith, wrth iddynt archwilio silff gudd, dywedodd Alys, "Wyt ti'n gweld hyn?

One evening, while examining a hidden shelf, Alys said, "Do you see this?"

"Hawdd i'w ddychmygu'r cyffro wrth iddynt agor y silff-gudd a darganfod cyfwng llawn dogfennau gwerthfawr a'r teuluoedd o genhadaeth gyfrinachol.

The thrill was easy to imagine as they opened the hidden shelf and discovered a compartment full of invaluable documents and family records from secret missions.

Roeddent yn gwirioni wrth fynd trwy'r papurau, gan sylweddoli pa mor werthfawr oedd eu darganfyddiad.

They were exhilarated as they went through the papers, realizing how valuable their find was.

Yn ddiweddarach, derbyniodd Alys wobr am ei hymchwil wych, tra sicrhaodd Gareth brosiect adnewyddu mawreddog.

Later, Alys received an award for her outstanding research, while Gareth secured a magnificent renovation project.

Ymlodd y ddau, gan wybod bod eu hymdrechion wedi dod â nhw at ei gilydd.

The two of them celebrated, knowing their efforts had brought them closer together.

Dechreuodd eu perthynas rhamantus, wedi'i bondio gan eu hantur.

Their romantic relationship blossomed, bonded by their adventure.

Dros amser, dysgodd Alys i weithredu gyda phobl eraill, tra gwerthfawrogodd Gareth y pwysigrwydd hanes yn ei fyd pensaernïol.

Over time, Alys learned to collaborate with others, while Gareth appreciated the importance of history in his architectural world.

Roedd eu hantur yn y bunkeri wedi newid y ddau, ac roeddent yn ddiolchgar am y cyfle i gydweithio ac adeiladu rhywbeth newydd ynghyd.

Their adventure in the bunker had changed them both, and they were grateful for the opportunity to work together and build something new together.