v3.26.1
Cover - shares
 6 Months Ended
Jun. 30, 2026
Aug. 03, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 000-56406  
Entity Registrant Name Deep Isolation Nuclear, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 87-4225965  
Entity Address, Address Line One 2001 Addison Street  
Entity Address, Address Line Two Suite 300  
Entity Address, City or Town Berkeley  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94704  
City Area Code (509)  
Local Phone Number 943-5222  
Title of 12(b) Security None.  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   57,667,113
Entity Central Index Key 0001918080  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Current Fiscal Year End Date --12-31