Craig Strickland's Wife Helen Praises Search Teams: 'Thank You for Refusing to Give Up'

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The search for missing country singer Craig Strickland entered its second week on Sunday, but his wife, Helen Strickland, isn't giving up hope.

Helen has been sharing updates on the search for her husband -- who went missing, along with a friend, during a duck hunting trip in Oklahoma on Dec. 26 -- sharing her gratitude with the volunteers and state police who have been working tirelessly to locate Craig.

WATCH: Craig Strickland’s Wife Holding Out Hope As Search For Him Continues

On Sunday, Helen wrote that search teams "located a cove that looked promising."

"Officers and one search & rescue K9 are currently searching the area. Hopefully positive news will follow this afternoon," she captioned a pic of the search team.

WATCH: Country Singer Craig Strickland Missing in Oklahoma, Friend Found Dead

Unfortunately, Craig had not been located as Sunday's search came to a close.

Helen also shared a group photo of the men and women looking for her husband, as well as a video of the frigid, barren hunting grounds that are being thoroughly combed over.

"Thank you for refusing to give up," Helen wrote under the video.

Craig, 29, and his friend, Chase Morland, 22, went missing after their boat capsized during a duck hunt in Oklahoma last weekend. Morland's body was recovered on Dec. 28, but Craig’s dog, who accompanied the duo on their hunting trip, was found alive, raising hopes that Craig might also be located.

WATCH: Craig Strickland's Wife Shares Update on The Couple's Found Dog: 'He Wouldn’t Leave Chase's Body'

It appears that Helen has been conducting a number of experiments on her own time with friends in an effort to see what could have happened to Craig after his boat capsized.

"We were unable to locate Craig Strickland today. However, we are able to stay positive after conducting an interesting experiment to see if waders actually cause a person to sink," she wrote the the caption of a video of her experiment, which she shared Saturday evening. "Since Craig was most likely wearing his waders it would be helpful to know what actually happens when a duck hunter falls into the water. Craig's friend put on the same style waders Craig wore last Sunday and tested it's buoyancy in the hotel pool. From this experiment we can conclude that Craig may have actually floated after the boat was capsized."

WATCH: Craig Strickland's Band Shares Sweet Tribute as Search Continues

Craig's family have been trying hard to remain hopeful in the wake of his disappearance, and they credit the love, support and prayers from family, friends and fans as what's sustaining them during this dark period.

Members of Craig's band, Backroad Anthem, have also been sharing updates on Facebook praising their missing frontman and sharing memories of his time with the group.

For more on Craig's disappearance and the efforts to locate him, check out the video below.