| Cover | May 21, 2024 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | May 21, 2024 |
| Entity File Number | 001-40450 |
| Entity Registrant Name | OceanTech Acquisitions I Corp. |
| Entity Central Index Key | 0001846809 |
| Entity Tax Identification Number | 85-2122558 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 515 Madison Avenue |
| Entity Address, Address Line Two | Suite 8133 |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10022 |
| City Area Code | (929) |
| Local Phone Number | 412-1272 |
| Written Communications | true |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Units, each consisting of one share of Class A Common Stock and one Redeemable Warrant | |
| Title of 12(b) Security | Units, each consisting of one share of Class A Common Stock and one Redeemable Warrant |
| Trading Symbol | OTECU |
| Security Exchange Name | NASDAQ |
| Class A Common Stock, $0.0001 par value per share | |
| Title of 12(b) Security | Class A Common Stock, $0.0001 par value per share |
| Trading Symbol | OTEC |
| Security Exchange Name | NASDAQ |
| Redeemable Warrants, each exercisable for one share of Class A Common Stock at an exercise price of $11.50 per share | |
| Title of 12(b) Security | Redeemable Warrants, each exercisable for one share of Class A Common Stock at an exercise price of $11.50 per share |
| Trading Symbol | OTECW |
| Security Exchange Name | NASDAQ |
